Networking

Subnet, IP, DNS, and port reference tools

Subnet Calculator

Calculate CIDR, subnet mask, host range, and network details.

Convert IP addresses between decimal, binary, and hex formats.

Validate IPv4 and IPv6 address formats.

Generate random MAC addresses with format options.

Look up manufacturer from MAC address OUI prefix.

Reference guide for well-known TCP/UDP port numbers.

Reference guide for common TCP and UDP protocols.

Reference guide for DNS record types and their purposes.

Reference for HTTP methods with descriptions and use cases.

Quick reference for all HTTP status codes by category.

Reference for SSL/TLS protocol versions and security status.

Calculate transfer time from file size and bandwidth.

Estimate download time for a file at a given speed.

Estimate network latency based on distance between locations.

Reference for Maximum Transmission Unit sizes by network type.