Ip2region is an offline IP-to-Region localization library and IP data management framework with both IPv4 and IPv6 supports, 10-microsecond level query efficiency, xdb search client for many programming languages

A modern, scalable, robust DHCPv4 and DHCPv6 server.

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

Powerful asynchronus IPv4 network scanner for PowerShell

🌐 Enhanced IP address querying with WebRTC

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

Collecting Tor Bridges.

🐧An ultra-lightweight firewall orchestrator for Linux. SysWarden proactively drops 97% of malicious internet traffic by fusing Data-Shield IPv4 blocklists, GeoIP, Spamhaus ASN, CINS Army, Blocklist.de, dynamic Fail2ban jails with a near-zero memory footprint.

PHP library for IPv4 subnet calculations, CIDR operations, and network planning.

A library for working with IP addresses and networks in Go

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

🍴 A toolkit for manipulating, validating and testing IP addresses and ranges, along with datasets relating to IP addresses. While it primarily has support for the IPv4 address space, more extensive IPv6 support is intended.

ipv6calc

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

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

Swift library for checking your IP address from ipify.org

A system administration related project

A middleware that allows whitelist or blacklist incomming requests based on IP address. It can be configured using single IP address or ranges. It supports single IP, IP range IPv4 and IPv6.