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Networking & Sysadmin

Subnet, bandwidth, ports, and DNS

Subnet Calculator

Network, broadcast, host range from IP + CIDR

IPv4 ↔ IPv6 Converter

Convert between IPv4 and IPv6

CIDR Range Visualizer

See which IPs fall within a CIDR block

Network Mask Calculator

Convert between dotted-decimal, CIDR, wildcard

Coming Soon

Bandwidth Calculator

Transfer time for file size at given speed

DNS Record Reference

Interactive DNS record type reference

Port Number Reference

Searchable common port database

MAC Address Lookup

Identify vendor from OUI prefix