net.
A small toolbox of networking utilities. Pick one:
IP / Subnet Calculator
IPv4 & IPv6 subnet math, flexible CIDR input, subnet splitting.
MAC Vendor Lookup
Offline IEEE OUI lookup (MA-L / MA-M / MA-S), refreshed daily.
Dig
DNS lookups against multiple resolvers at once.
PPS ↔ Bandwidth
Convert between packet rate and bandwidth, with encapsulation overhead.
Transfer Time
How long a file transfer takes at a given bandwidth, with protocol overhead.