Network Tools
A growing set of browser-based network utilities for converting between IPv4 addresses, 32-bit integers, and IPv6 forms. Everything runs locally in your browser, so nothing you paste is ever sent to a server.
IP to Long Converter
Convert a dotted-quad IPv4 address into its 32-bit unsigned integer form.
Open toolLong to IP Converter
Convert a 32-bit unsigned integer back into a dotted-quad IPv4 address.
Open toolIPv4 to IPv6 Converter
Convert an IPv4 address into its IPv4-mapped IPv6 form.
Open toolIPv6 to IPv4 Converter
Extract the embedded IPv4 address from an IPv4-mapped, 6to4, or NAT64 IPv6 address.
Open toolNginx Rewrite Generator
Build Nginx rewrite and redirect rules from a list of from/to paths.
Open toolIP Allow List Generator
Build a CIDR-based allow or deny list for Nginx, HAProxy, or iptables.
Open toolFirewall Rules Generator
Build firewall rules for UFW, iptables, or nftables from port/protocol/source/action rows.
Open toolCIDR Subnet Calculator
Compute network address, broadcast, host range, and optional subnets from a CIDR block.
Open toolIP Range to CIDR Converter
Convert a start/end IPv4 range into the minimal list of CIDR blocks that cover it exactly.
Open tool