IP Address Class & Type
Identify an IPv4 address's class (A–E), whether it is private, public, loopback or link-local, and see its binary and integer forms, free online.
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Classful ranges: A 1–126 (/8), B 128–191 (/16), C 192–223 (/24), D 224–239 (multicast), E 240–255 (reserved). Private ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16. Also special: 127/8 loopback, 169.254/16 link-local, 100.64/10 carrier-grade NAT.