Network Utilities
Networking Tools
Free browser-based utilities for subnetting, IP addressing, CIDR, ports, DNS and everyday network administration.
Available tools
Choose a tool to get started.
Subnet Calculator
Calculate network address, broadcast address, subnet mask, host range and usable hosts from an IPv4 address and prefix.
CIDR Calculator
Convert CIDR prefixes and calculate address ranges, masks and network sizes.
IP Range Calculator
Calculate IPv4 address ranges and determine the start, end and number of addresses.
IP Calculator
Analyze an IP address and subnet mask to calculate key network information.
IPv4 ↔ Binary Converter
Convert IPv4 addresses between dotted-decimal and binary representations.
Subnet Mask ↔ CIDR Converter
Convert subnet masks to CIDR prefix lengths and CIDR prefixes back to subnet masks.
IP Address Class Checker
Identify IPv4 address class, private/public range and related address information.
Port Lookup
Look up common TCP and UDP port numbers and their associated services.
Port Checker
Check whether a TCP port is reachable on a host or public IP address.
DNS Lookup
Query common DNS record types such as A, AAAA, MX, TXT, CNAME and NS.
MAC Address Formatter
Convert MAC addresses between colon, hyphen, dotted and plain formats.
IPv6 Shortener / Expander
Compress or expand IPv6 addresses into standard notation.
About Networking Tools
Free browser-based utilities for subnetting, IP addressing, CIDR, ports, DNS and everyday network administration. New utilities will be added as the collection grows.