Ip2region is an offline IP address manager framework and locator with both IPv4 and IPv6 supported, supporting billions of data segments, ten microsecond searching performance, xdb search client for many programming languages

A modern, scalable, robust DHCPv4 and DHCPv6 server. *** ISC is hiring for a full-stack developer and a QA engineer for our open source Stork GUI management application for DHCP and DNS. https://www.isc.org/careers/

Java library for handling IP addresses and subnets, both IPv4 and IPv6

IPv6 address rate limiting evasion tool (that also supports IPv4)

radvd | Official repository: https://github.com/radvd-project/radvd

Collecting Tor Bridges.

A library for working with IP addresses and networks in Go

IP/IPv6 to region on Node.js （IP/IPv6 地址到区域运营商）

High-performance match IP address for Nginx + Lua

IPv4 and IPv6 traceroute fake hop generator through IP spoofing

Go library for handling IP addresses and subnets, both IPv4 and IPv6

Utility to convert IPv6 addresses to and from a user friendly word based format

IP Address utility classes for PHP

IPv6 Subnet Calculator / Tool application helps you plan/subnet your assigned IPv6 address for all 128 bits.

ipv6calc

IPv6 prefix generator

Fast Java library for working with IP addresses, ranges, and subnets

中国大陆IPv6地址库（北京时间每日6:00自动构建）

A browser extension, which shows you the origin of your IP address.