IPv6 Utilities

This go project is the combination of some older python scripts that performed the same function, with a few more added features. Web version of this utlity can be found here.

Current capabilities:

IPv6 Subnet Generator & RFC 6052 Converter

A command-line utility for IPv6 subnet generation and IPv4/IPv6 address translation using RFC 6052. The pre-compiled binary is compiled for Apple silicon.

Features

• IPv6 Subnet Generation
  • Generate subnets from an IPv6 prefix.
  • Optionally limit output using -l flag.
• IPv4 ↔ RFC 6052 IPv6 Conversion
  • Convert IPv4 to a synthesized IPv6 address (-s IPv4).
  • Convert an RFC 6052 IPv6 address back to IPv4.
• Custom Prefix Support (-k)
  • Allows non-well-known prefixes.
• Decode MAC address from SLAAC address (-m)
  • Decode MAC addresses from non-privacy SLAAC addresses
• Decode link local addresses (-a)
  • Decode link local address to MAC, and MAC to link local
• Generate ip6.arpa DNS names from IPv6 addresses (-ip6.arpa IPv6)
  • Generate a partial reverse DNS name for use in an ip6.arpa zone file a specified prefix length (-n)
  • Generate a full reverse DNS name with -n 0

---

Installation

This should build on any system that can run golang, but has really only been tested on MacOS and Linux.

git clone https://github.com/buraglio/ipv6utils.git

cd ipv6utils

go build -o ipv6utils ip6utils.go

Move binary to wherever you want it to reside within your path, or reference it via a shell alias.

Homebrew Installation (MacOS)

brew tap buraglio/ipv6utils

brew install ipv6utils

Use

Usage: ./ipv6utils

  -a string
        Alias for -local
  -c    Alias for -count
  -count
        Display only the number of generated prefixes. (alias: -c)
  -ip6.arpa string
        Generate a reverse ip6.arpa name for an IPv6 address. Uses -new-prefix-length as zone context.
  -k string
        Non-well-known prefix for RFC 6052 conversion. (default "64:ff9b::")
  -l int
        Limit the number of subnets displayed.
  -local string
        Link-local MAC or IPv6 to convert. (alias: -a)
  -m string
        SLAAC IPv6 address to decode MAC from.
  -n int
        Alias for -new-prefix-length (default 40)
  -new-prefix-length int
        New prefix length for subnet allocation. (alias: -n) (default 40)
  -o string
        Alias for -output
  -output string
        File to save the output subnets. (alias: -o)
  -p string
        Alias for -prefix (default "64:ff9b::")
  -prefix string
        IPv6 prefix for synthesis. (alias: -p) (default "64:ff9b::")
  -s string
        Source address for conversion.

Link local decoder

./ipv6utils.go -local fe80::0211:22ff:fe33:4455

Output:

MAC from link-local: 00:11:22:33:44:55

./ipv6utils.go -local 00:11:22:33:44:55

Output:

Link-local address: fe80::0211:22ff:fe33:4455

IPv4 → Synthesized IPv6

./ipv6utils -s 8.8.8.8

Output:

Converted IPv4 to synthesized IPv6: 64:ff9b::808:808

Synthesized IPv6 → IPv4

./ipv6utils -s 64:ff9b::808:808

Output:

Converted synthesized IPv6 to IPv4: 8.8.8.8

Generate Subnets

./ipv6utils -p 3fff::0::/32 -n 40 -l 5

Output:

3fff::/40
3fff:0:100::/40
3fff:0:200::/40
3fff:0:300::/40
3fff:0:400::/40

Save subnets to a File

./ipv6utils -p 3fff:0::/32 -n 40 -o subnets.txt

Output:

Subnets saved to subnets.txt

Decode MAC from SLAAC address (legacy)

Usage Example for -m:

./ipv6utils -m 3fff:0::0200:5eff:fe00:5325

Output:

Decoded MAC address: 00:00:5e:00:53:25

Generate ip6.arpa DNS names

Set prefix length to 0 for the full ip6.arpa name:

./ipv6utils -ip6.arpa 2001:db8:abcd::0211:22ff:fe33:4455 -n 0

Output:

5.5.4.4.3.3.e.f.f.f.2.2.1.1.2.0.0.0.0.0.d.c.b.a.8.b.d.0.1.0.0.2.ip6.arpa.

Set the prefix length of a DNS zone file for a partial name:

./ipv6utils -ip6.arpa 2001:db8:abcd::0211:22ff:fe33:4455 -n 56

Output:

5.5.4.4.3.3.e.f.f.f.2.2.1.1.2.0.0.0