https://github.com/jimmystewpot/in-addr

A subnet to in-addr ptr address file creation tool
https://github.com/jimmystewpot/in-addr

generate golang-application ipv4-subnetting ipv6-subnetting ptr tool

Last synced: about 2 months ago
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A subnet to in-addr ptr address file creation tool

• Host: GitHub
• URL: https://github.com/jimmystewpot/in-addr
• Owner: jimmystewpot
• License: mit
• Created: 2024-04-04T07:20:00.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2025-11-16T05:19:03.000Z (3 months ago)
• Last Synced: 2025-11-16T06:11:38.761Z (3 months ago)
• Topics: generate, golang-application, ipv4-subnetting, ipv6-subnetting, ptr, tool
• Language: Go
• Homepage:
• Size: 74.2 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# in-addr

[![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=jimmystewpot_in-addr&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=jimmystewpot_in-addr)

A simple tool to take a subnet mask and print out the in-addr reverse order to stdout.

This simplifies creating entire network ranges of files for DNS reverse lookup etc.

## IPv4

```

$ ./ptr generate 192.168.15.99/20

0.168.192.in-addr.arpa.

1.168.192.in-addr.arpa.

2.168.192.in-addr.arpa.

3.168.192.in-addr.arpa.

4.168.192.in-addr.arpa.

5.168.192.in-addr.arpa.

6.168.192.in-addr.arpa.

7.168.192.in-addr.arpa.

8.168.192.in-addr.arpa.

9.168.192.in-addr.arpa.

10.168.192.in-addr.arpa.

11.168.192.in-addr.arpa.

12.168.192.in-addr.arpa.

13.168.192.in-addr.arpa.

14.168.192.in-addr.arpa.

15.168.192.in-addr.arpa.

```

## IPv6

```

$ ./ptr generate 2001:db8:abcd:1234::1/56

0.0.2.1.d.c.b.a.8.b.d.0.1.0.0.2.in-addr.arpa.

1.0.2.1.d.c.b.a.8.b.d.0.1.0.0.2.in-addr.arpa.

2.0.2.1.d.c.b.a.8.b.d.0.1.0.0.2.in-addr.arpa.

3.0.2.1.d.c.b.a.8.b.d.0.1.0.0.2.in-addr.arpa.

4.0.2.1.d.c.b.a.8.b.d.0.1.0.0.2.in-addr.arpa.

5.0.2.1.d.c.b.a.8.b.d.0.1.0.0.2.in-addr.arpa.

6.0.2.1.d.c.b.a.8.b.d.0.1.0.0.2.in-addr.arpa.

....

```

## Building

```

go build -o ptr cmd/in-addr/main.go

```