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https://github.com/praetorian-inc/nerva

Fast service fingerprinting CLI for 170+ protocols (TCP/UDP/SCTP) - built by Praetorian
https://github.com/praetorian-inc/nerva

capability cli-tool external-network-security go-library network-scanner pentesting port-scanner protocol-detection reconnaissance sctp security-tool service-discovery service-fingerprinting telecom

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Fast service fingerprinting CLI for 170+ protocols (TCP/UDP/SCTP) - built by Praetorian

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README 

          
Nerva - Fast service fingerprinting CLI for network reconnaissance supporting 170+ protocols



  Nerva

  


  Nerva: Fast Service Fingerprinting CLI






Release

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  Features •

  Installation •

  Quick Start •

  Usage •

  Protocols •

  Library •

  Use Cases •

  Troubleshooting




> **High-performance service fingerprinting written in Go.** Identify 170+ network protocols across TCP, UDP, and SCTP transports with rich metadata extraction.



Nerva rapidly detects and identifies services running on open network ports. Use it alongside port scanners like [Naabu](https://github.com/projectdiscovery/naabu) to fingerprint discovered services, or integrate it into your security pipelines for automated reconnaissance.



## Features



- **170+ Protocol Plugins** — Databases, remote access, web services, messaging, industrial, and telecom protocols

- **76 HTTP Fingerprinters** — Detect web technologies including firewalls, databases, AI/LLM servers, and more

- **Security Misconfiguration Detection** — Identify common security issues like unauthenticated APIs and cleartext protocols (`--misconfigs`)

- **Multi-Transport Support** — TCP (default), UDP (`--udp`), and SCTP (`--sctp`, Linux only)

- **Proxy Support** — Route scanning traffic transparently through SOCKS5 or HTTP proxies with configurable DNS resolution

- **Rich Metadata** — Extract versions, configurations, and security-relevant details from each service

- **Fast Mode** — Scan only default ports for rapid reconnaissance (`--fast`)

- **Flexible Output** — JSON, CSV, or human-readable formats

- **Pipeline Friendly** — Pipe from Naabu, Nmap, or any tool that outputs `host:port`

- **Go Library** — Import directly into your Go applications



## Installation



### Releases

Download a prebuilt binary from the [Releases](https://github.com/praetorian-inc/nerva/releases) page.



### From GitHub



```sh

go install github.com/praetorian-inc/nerva/cmd/nerva@latest

```



### From Source



```sh

git clone https://github.com/praetorian-inc/nerva.git

cd nerva

go build ./cmd/nerva

./nerva -h

```



### Docker



```sh

git clone https://github.com/praetorian-inc/nerva.git

cd nerva

docker build -t nerva .

docker run --rm nerva -h

docker run --rm nerva -t example.com:80 --json

```



## Quick Start



Fingerprint a single target:



```sh

nerva -t example.com:22

# ssh://example.com:22

```



Get detailed JSON metadata:



```sh

nerva -t example.com:22 --json

# {"host":"example.com","ip":"93.184.216.34","port":22,"protocol":"ssh","transport":"tcp","metadata":{...}}

```



Pipe from a port scanner:



```sh

naabu -host example.com -silent | nerva

# http://example.com:80

# ssh://example.com:22

# https://example.com:443

```



## Usage



```

nerva [flags]



TARGET SPECIFICATION:

  Requires host:port or ip:port format. Assumes ports are open.



EXAMPLES:

  nerva -t example.com:80

  nerva -t example.com:80,example.com:443

  nerva -l targets.txt

  nerva --json -t example.com:80

  cat targets.txt | nerva

```



### Flags



| Flag | Short | Description | Default |

|------|-------|-------------|---------|

| `--targets` | `-t` | Target or comma-separated target list | — |

| `--list` | `-l` | Input file containing targets | — |

| `--output` | `-o` | Output file path | stdout |

| `--json` | | Output in JSON format | false |

| `--csv` | | Output in CSV format | false |

| `--misconfigs` | | Enable security misconfiguration detection | false |

| `--proxy` | | Proxy URL (e.g. socks5://127.0.0.1:1080) | — |

| `--proxy-auth` | | SOCKS5 Proxy Auth (e.g. username:password) | — |

| `--dns-order` | | DNS resolution order: `p`, `l`, `lp`, `pl` | `lp` |

| `--fast` | `-f` | Fast mode (default ports only) | false |

| `--capabilities` | `-c` | List available capabilities and exit | false |

| `--udp` | `-U` | Run UDP plugins | false |

| `--sctp` | `-S` | Run SCTP plugins (Linux only) | false |

| `--timeout` | `-w` | Timeout in milliseconds | 2000 |

| `--verbose` | `-v` | Verbose output to stderr | false |

| `--workers` | `-W` | Concurrent scan workers | 50 |

| `--max-host-conn` | `-H` | Max concurrent connections per host IP (0=unlimited) | 0 |

| `--rate-limit` | `-R` | Max scans per second globally (0=unlimited) | 0 |



### Examples



**Multiple targets:**



```sh

nerva -t example.com:22,example.com:80,example.com:443

```



**From file:**



```sh

nerva -l targets.txt --json -o results.json

```



**UDP scanning** (may require root):



```sh

sudo nerva -t example.com:53 -U

# dns://example.com:53

```



**SCTP scanning** (Linux only):



```sh

nerva -t telecom-server:3868 -S

# diameter://telecom-server:3868

```



**Fast mode** (default ports only):



```sh

nerva -l large-target-list.txt --fast --json

```



**Proxy routing with remote DNS resolution:**



```sh

nerva -t target.internal:80 --proxy socks5://127.0.0.1:1080 --dns-order p

```



### Security Misconfiguration Detection



Nerva can identify common security misconfigurations when enabled with `--misconfigs`:



```sh

nerva -t example.com:2375 --misconfigs --json

```



**Detected misconfigurations:**



| Finding ID | Severity | Description |

|------------|----------|-------------|

| `docker-unauth-api` | Critical | Docker API accessible without authentication |

| `x11-unauth-access` | Critical | X11 server allows unauthenticated connections |

| `smb-signing-not-required` | Medium | SMB signing not required (relay attack risk) |

| `telnet-cleartext` | Medium | Telnet transmits credentials in cleartext |

| `vnc-detected` | Medium | VNC detected (often weak authentication) |

| `ssh-password-auth` | Medium | Server allows password authentication |

| `ssh-weak-cipher` | Low | Server offers weak ciphers (RC4, 3DES, Blowfish) |

| `ssh-weak-kex` | Low | Server offers weak key exchange algorithms |

| `ssh-weak-mac` | Low | Server offers weak MAC algorithms |

| `ftp-cleartext` | Low | FTP transmits credentials in cleartext |



**Example output with misconfigs:**



```json

{

  "host": "example.com",

  "port": 2375,

  "protocol": "docker",

  "anonymous_access": true,

  "security_findings": [

    {

      "id": "docker-unauth-api",

      "severity": "critical",

      "description": "Docker API accessible without authentication",

      "evidence": "Successfully queried /version endpoint without credentials"

    }

  ]

}

```



### Proxy Support



Nerva supports routing scanning traffic through SOCKS5 and HTTP proxies with configurable DNS resolution.



**Supported proxy schemes:**



- `socks5://` - SOCKS5 proxy with local DNS resolution

- `socks5h://` - SOCKS5 proxy with proxy-side DNS resolution (always)

- `http://` - HTTP CONNECT proxy

- `https://` - HTTPS CONNECT proxy



**Proxy authentication:**



```sh

# Inline authentication (URL format)

nerva -t example.com:80 --proxy socks5://username:password@127.0.0.1:1080



# Separate authentication flag

nerva -t example.com:80 --proxy socks5://127.0.0.1:1080 --proxy-auth username:password

```



**DNS resolution strategies** (`--dns-order`):



| Option | Strategy | Use Case |

|--------|----------|----------|

| `l` | Local only | Standard local DNS (default) |

| `p` | Proxy only | Force proxy-side DNS resolution |

| `lp` | Local, fallback to proxy | Try local first, use proxy on failure |

| `pl` | Proxy, fallback to local | Try proxy first, use local on failure |



**Note:** `socks5h://` scheme automatically forces proxy-side DNS (equivalent to `--dns-order p`)



**Tor scanning example:**



```sh

# Scan .onion services through Tor (SOCKS5 proxy on port 9050)

nerva -t http://example.onion:80 --proxy socks5h://127.0.0.1:9050

```



**UDP through proxy:**



```sh

# UDP scanning through SOCKS5 proxy (limited support)

nerva -t target.com:161 --proxy socks5://127.0.0.1:1080 --udp

```



⚠️ **UDP Limitations:** UDP through SOCKS5 has limited support. Not all SOCKS5 servers support UDP association. Local UDP fallback may occur.



**Parallel scanning with rate limiting:**



```sh

nerva -l large-target-list.txt -W 100 -H 5 -R 50 -v

```



**Graceful shutdown** (Ctrl+C returns partial results):



```sh

nerva -l huge-target-list.txt -W 50 -v

# Press Ctrl+C to stop — collected results are still printed

```



## Supported Protocols



**170+ service detection plugins** across TCP, UDP, and SCTP:



### HTTP Fingerprint Modules (66)



Technology detection for web services, organized by category:



#### Firewalls & Network Security (12)



| Module | Description |

|--------|-------------|

| Checkpoint | Check Point Security Gateway |

| Cisco ASA/FTD | Cisco firewall/VPN appliances |

| FortiGate | Fortinet firewall/VPN |

| GlobalProtect | Palo Alto Networks VPN |

| Juniper | Juniper SRX firewalls |

| OPNsense | OPNsense firewall |

| pfSense | pfSense firewall |

| SonicWall | SonicWall firewalls |

| AnyConnect | Cisco AnyConnect SSL VPN |

| Cisco Expressway | Cisco collaboration gateway |

| BigIP | F5 BIG-IP load balancer |

| WinRM | Windows Remote Management |



#### AI/LLM & Machine Learning (6)



| Module | Description |

|--------|-------------|

| Ollama | Self-hosted LLM inference server |

| LocalAI | Self-hosted LLM inference (OpenAI-compatible) |

| Open WebUI | LLM web interface (ChatGPT-style) |

| Triton | NVIDIA Triton Inference Server |

| Weaviate | Vector database for AI |

| ChromaDB | Vector database |



#### Databases & Data Stores (12)



| Module | Description |

|--------|-------------|

| ArangoDB | Multi-model database |

| CockroachDB | Distributed SQL database |

| CouchDB | Apache document database |

| Elasticsearch | Search and analytics engine |

| etcd | Distributed key-value store |

| Milvus | Vector database |

| MinIO | S3-compatible object storage |

| Pinecone | Vector database |

| Redis Commander | Redis web management UI |

| TiDB | Distributed SQL database |

| YugabyteDB | Distributed SQL database |

| Qdrant | Vector database |



#### DevOps & Infrastructure (14)



| Module | Description |

|--------|-------------|

| Artifactory | JFrog artifact repository |

| Consul | HashiCorp service mesh |

| Docker Registry | Container image registry |

| Gitea | Self-hosted Git service |

| Grafana | Observability platform |

| Harbor | Container registry |

| Jaeger | Distributed tracing |

| Jenkins | CI/CD automation |

| Kubernetes | Container orchestration API |

| Portainer | Docker management UI |

| Prometheus | Monitoring system |

| Swagger/OpenAPI | API documentation |

| TeamCity | CI/CD server |

| Vault | HashiCorp secrets management |



#### Web Servers & Frameworks (10)



| Module | Description |

|--------|-------------|

| Apache HTTPD | Apache HTTP Server |

| Express.js | Node.js web framework |

| GoAhead | Embedded web server |

| Gotenberg | PDF generation service |

| Guacamole | Apache remote desktop gateway |

| SOAP | Web services |

| Tengine | Alibaba web server |

| Tomcat | Apache Tomcat |

| WordPress | CMS platform |

| UPnP | Universal Plug and Play |



#### Enterprise & Business (8)



| Module | Description |

|--------|-------------|

| AEM | Adobe Experience Manager |

| Dynamics 365 | Microsoft Dynamics 365 / Power Apps |

| Oracle Service Cloud | Oracle CRM platform |

| SAP NetWeaver | SAP enterprise platform |

| Splunk | Log management platform |

| VMware Horizon | Virtual desktop infrastructure |

| QNAP QTS | NAS management |

| Exchange | Microsoft Exchange Server |



#### Home & IoT (2)



| Module | Description |

|--------|-------------|

| Home Assistant | Home automation platform |

| UniFi/EdgeOS | Ubiquiti network devices |



#### Other (2)



| Module | Description |

|--------|-------------|

| Go pprof | Go profiling endpoints |

| NATS | Message broker |



### Databases (20)



| Protocol | Transport | Default Ports |

|----------|-----------|---------------|

| PostgreSQL | TCP | 5432 |

| MySQL | TCP | 3306 |

| MSSQL | TCP | 1433 |

| Oracle | TCP | 1521 |

| MongoDB | TCP | 27017 |

| Redis | TCP/TLS | 6379, 6380 |

| Cassandra | TCP | 9042 |

| InfluxDB | TCP | 8086 |

| Neo4j | TCP/TLS | 7687 |

| DB2 | TCP | 446, 50000 |

| Sybase | TCP | 5000 |

| Firebird | TCP | 3050 |

| Memcached | TCP | 11211 |

| ZooKeeper | TCP | 2181 |

| Milvus | TCP | 19530, 9091 |

| CouchDB | HTTP | 5984 |

| Elasticsearch | HTTP | 9200 |

| ArangoDB | HTTP | 8529 |

| ChromaDB | HTTP | 8000 |

| Pinecone | HTTP | 443 |



### Remote Access (6)



| Protocol | Transport | Default Ports |

|----------|-----------|---------------|

| SSH | TCP | 22, 2222 |

| RDP | TCP/TLS | 3389 |

| Telnet | TCP | 23 |

| VNC | TCP | 5900 |

| AnyDesk | TCP | 7070 |

| TeamViewer | TCP | 5938 |



### Web & API (2)



| Protocol | Transport | Notes |

|----------|-----------|-------|

| HTTP/HTTPS | TCP | HTTP/2, tech detection via Wappalyzer |

| Kubernetes | TCP | API server detection |



### Messaging & Queues (10)



| Protocol | Transport | Default Ports |

|----------|-----------|---------------|

| Kafka | TCP/TLS | 9092, 9093 |

| MQTT 3/5 | TCP/TLS | 1883, 8883 |

| AMQP | TCP/TLS | 5672, 5671 |

| ActiveMQ | TCP/TLS | 61616, 61617 |

| NATS | TCP/TLS | 4222, 6222 |

| Pulsar | TCP/TLS | 6650, 6651 |

| SMTP | TCP/TLS | 25, 465, 587 |

| POP3 | TCP/TLS | 110, 995 |

| IMAP | TCP/TLS | 143, 993 |

| SMPP | TCP | 2775, 2776 |



### File & Directory Services (7)



| Protocol | Transport | Default Ports |

|----------|-----------|---------------|

| FTP | TCP | 21 |

| SMB | TCP | 445 |

| NFS | TCP/UDP | 2049 |

| Rsync | TCP | 873 |

| TFTP | UDP | 69 |

| SVN | TCP | 3690 |

| LDAP | TCP/TLS | 389, 636 |



### Network Services (11)



| Protocol | Transport | Default Ports |

|----------|-----------|---------------|

| DNS | TCP/UDP | 53 |

| DHCP | UDP | 67, 68 |

| NTP | UDP | 123 |

| SNMP | UDP | 161 |

| NetBIOS-NS | UDP | 137 |

| STUN | UDP | 3478 |

| OpenVPN | UDP | 1194 |

| IPsec | UDP | 500 |

| IPMI | UDP | 623 |

| CoAP | UDP | 5683 |

| Echo | TCP/UDP | 7 |



### Industrial Control Systems (18)



| Protocol | Transport | Default Ports | Notes |

|----------|-----------|---------------|-------|

| Modbus | TCP | 502 | SCADA/PLC |

| S7comm | TCP | 102 | Siemens PLC |

| EtherNet/IP | TCP | 44818 | Rockwell/Allen-Bradley |

| PROFINET | TCP | 34962-34964 | Siemens industrial |

| BACnet | UDP | 47808 | Building automation |

| OPC UA | TCP | 4840 | Industrial interop |

| OMRON FINS | TCP/UDP | 9600 | OMRON PLC |

| MELSEC-Q | TCP | 5006, 5007 | Mitsubishi PLC |

| KNXnet/IP | UDP | 3671 | Building automation |

| IEC 104 | TCP | 2404 | Power grid SCADA |

| DNP3 | TCP | 20000 | Power grid SCADA |

| Codesys | TCP | 1200, 2455 | PLC runtime |

| Fox | TCP | 1911 | Tridium Niagara |

| PC WORX | TCP | 1962 | Phoenix Contact |

| ProConOS | TCP | 20547 | PLC runtime |

| HART-IP | TCP | 5094 | Process automation |

| EtherCAT | UDP | 34980 | Motion control |

| Crimson v3 | TCP | 789 | Red Lion HMI |

| PCOM | TCP | 20256 | Unitronics PLC |

| GE SRTP | TCP | 18245 | GE PLC |

| ATG | TCP | 10001 | Tank gauges |



### Telecom & VoIP (17)



| Protocol | Transport | Default Ports | Notes |

|----------|-----------|---------------|-------|

| Diameter | TCP/SCTP | 3868 | LTE/5G AAA |

| M3UA | SCTP | 2905 | SS7 over IP |

| M2UA | SCTP | 2904 | MTP2 User Adaptation |

| M2PA | SCTP | 3565 | MTP2 Peer Adaptation |

| SGsAP | SCTP | 29118 | Circuit-switched fallback |

| X2AP | SCTP | 36422 | LTE inter-eNodeB |

| IUA | SCTP | 9900 | ISDN over IP |

| SIP | TCP/UDP/TLS | 5060, 5061 | VoIP signaling |

| MEGACO/H.248 | UDP | 2944, 2945 | Media gateway |

| MGCP | UDP | 2427, 2727 | Media gateway |

| H.323 | TCP | 1720 | Video conferencing |

| SCCP/Skinny | TCP | 2000, 2443 | Cisco IP phones |

| IAX2 | UDP | 4569 | Asterisk protocol |

| GTP-C | UDP | 2123 | GPRS control |

| GTP-U | UDP | 2152 | GPRS user plane |

| GTP' | UDP | 3386 | GPRS charging |

| PFCP | UDP | 8805 | 5G user plane |



### VPN & Security (11)



| Protocol | Transport | Default Ports |

|----------|-----------|---------------|

| SSH | TCP | 22, 2222 |

| OpenVPN | UDP | 1194 |

| WireGuard | UDP | 51820 |

| IPsec/IKEv2 | UDP | 500, 4500 |

| L2TP | UDP | 1701 |

| SSTP | TCP | 443 |

| GlobalProtect | HTTP | 443 |

| AnyConnect | HTTP | 443 |

| FortiGate | HTTP | 443 |

| STUN/TURN | UDP | 3478, 5349 |

| Kerberos | TCP | 88 |



### Remote Access & Management (10)



| Protocol | Transport | Default Ports |

|----------|-----------|---------------|

| RDP | TCP/TLS | 3389 |

| VNC | TCP | 5900 |

| Telnet | TCP | 23 |

| WinRM | HTTP | 5985, 5986 |

| IPMI | UDP | 623 |

| SNMP | UDP | 161 |

| Zabbix Agent | TCP | 10050 |

| NRPE | TCP/TLS | 5666 |

| Docker | TCP/TLS | 2375, 2376 |

| X11 | TCP | 6000-6063 |



### Developer Tools (8)



| Protocol | Transport | Default Ports |

|----------|-----------|---------------|

| HTTP/HTTPS | TCP | 80, 443, 8080, 8443 |

| Java RMI | TCP | 1099 |

| JDWP | TCP | 5005 |

| RTSP | TCP | 554 |

| Linux RPC | TCP | 111 |

| JetDirect | TCP | 9100 |

| CUPS/IPP | TCP | 631 |

| SonarQube | TCP | 9000 |



## Library Usage



Import Nerva into your Go applications:



```go

package main



import (

    "context"

    "fmt"

    "log"

    "net/netip"

    "time"



    "github.com/praetorian-inc/nerva/pkg/plugins"

    "github.com/praetorian-inc/nerva/pkg/scan"

)



func main() {

    // Configure scan

    config := scan.Config{

        DefaultTimeout: 2 * time.Second,

        FastMode:       false,

        UDP:            false,

        Proxy:          "socks5://127.0.0.1:1080", // optional

        ProxyAuth:      "username:password",       // optional

        DNSOrder:       "p",                       // resolver strategy

    }



    // Create target

    ip, _ := netip.ParseAddr("93.184.216.34")

    target := plugins.Target{

        Address: netip.AddrPortFrom(ip, 22),

        Host:    "example.com",

    }



    // Run scan

    results, err := scan.ScanTargets(context.Background(), []plugins.Target{target}, config)

    if err != nil {

        log.Fatal(err)

    }



    // Process results

    for _, result := range results {

        fmt.Printf("%s:%d - %s (%s)\n",

            result.Host, result.Port,

            result.Protocol, result.Transport)

    }

}

```



See [examples/service-fingerprinting-example.go](examples/service-fingerprinting-example.go) for a complete working example.



## Use Cases



### Penetration Testing



Rapidly fingerprint services discovered during reconnaissance to identify potential attack vectors.



### Asset Discovery Pipelines



Combine with Naabu or Masscan for large-scale asset inventory:



```sh

naabu -host 10.0.0.0/24 -silent | nerva --json | jq '.protocol'

```



### CI/CD Security Scanning



Integrate into deployment pipelines to verify only expected services are exposed.



### Bug Bounty Reconnaissance



Quickly enumerate services across scope targets to find interesting endpoints.



### Telecom Network Analysis



Fingerprint Diameter nodes in LTE/5G networks using SCTP transport (Linux):



```sh

nerva -t mme.telecom.local:3868 -S --json

```



## Architecture



```mermaid

graph LR

    A[host:port input] --> B[Target Parser]

    B --> C[Scan Engine]

    C --> D{Transport}

    D -->|TCP| E[TCP Plugins]

    D -->|UDP| F[UDP Plugins]

    D -->|SCTP| G[SCTP Plugins]

    E --> H[Service Detection]

    F --> H

    G --> H

    H --> I[Metadata Extraction]

    I --> J[JSON/CSV/Text Output]

```



## Why Nerva?



### vs Nmap



- **Smarter defaults**: Nerva checks the most likely protocol first based on port number

- **Structured output**: Native JSON/CSV support for easy parsing and pipeline integration

- **Focused**: Service fingerprinting only — pair with dedicated port scanners for discovery



### vs zgrab2



- **Auto-detection**: No need to specify protocol ahead of time

- **Simpler usage**: `nerva -t host:port` vs `echo host | zgrab2 http -p port`



## Troubleshooting



### No output



**Cause**: Port is closed or no supported service detected.



**Solution**: Verify the port is open:



```sh

nc -zv example.com 80

```



### Timeout errors



**Cause**: Default 2-second timeout too short for slow services.



**Solution**: Increase timeout:



```sh

nerva -t example.com:80 -w 5000  # 5 seconds

```



### UDP services not detected



**Cause**: UDP scanning disabled by default.



**Solution**: Enable with `-U` flag (may require root):



```sh

sudo nerva -t example.com:53 -U

```



### SCTP not working



**Cause**: SCTP only supported on Linux.



**Solution**: Run on a Linux system or container:



```sh

docker run --rm nerva -t telecom:3868 -S

```



## Terminology



- **Service**: A network service running on a port (SSH, HTTP, PostgreSQL, etc.)

- **Fingerprinting**: Detecting and identifying the service type, version, and configuration

- **Plugin**: A protocol-specific detection module

- **Fast Mode**: Scanning only the default port for each protocol (80/20 optimization)

- **Transport**: Network layer protocol (TCP, UDP, or SCTP)



## Support



If you find Nerva useful, please consider giving it a star:



[![GitHub stars](https://img.shields.io/github/stars/praetorian-inc/nerva?style=social)](https://github.com/praetorian-inc/nerva)



## Contributing



We welcome contributions! See [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines.



## License



Apache 2.0 — see [LICENSE](LICENSE) for details.



## Acknowledgements



Nerva is a maintained fork of [fingerprintx](https://github.com/praetorian-inc/fingerprintx), originally developed by Praetorian's intern class of 2022:



* [Soham Roy](https://github.com/praetorian-sohamroy)

* [Jue Huang](https://github.com/jue-huang)

* [Henry Jung](https://github.com/henryjung64)

* [Tristan Wiesepape](https://github.com/qwetboy10)

* [Joseph Henry](https://github.com/jwhenry28)

* [Noah Tutt](https://github.com/noahtutt)

* [Nathan Sportsman](https://github.com/nsportsman)