asn.dev

Address space

AS31 CIT

Unclassified ARIN

IPv4 prefixes 15 132K addresses
IPv6 prefixes 3
Most common size /24 IPv4
Flagged 4

Shape

IPv4 prefix sizes

All IPv4
/16
/16: 1
1
/17
/17: 1
1
/18
/18: 1
1
/19
/19: 1
1
/20
/20: 1
1
/21
/21: 1
1
/22
/22: 1
1
/23
/23: 1
1
/24
/24: 5
5
/31
/31: 2
2

A wall of /24s usually means many small customer assignments or fine-grained traffic engineering; a few short prefixes means large contiguous allocations announced whole.

Shape

IPv6 prefix sizes

All IPv6
/32
/32: 1
1
/123
/123: 2
2

Geography

Where the space lands

CountryNamePrefixes
USUnited States of America18

Review

Flagged prefixes

4 of 18
PrefixFamilyAddressesCountryFlags
137.164.3.74/31IPv42USToo specific
137.164.3.204/31IPv42USToo specific
2607:f380:1::118:9a40:34a0/123IPv6/123USToo specific
2607:f380:1::118:9a40:3cc0/123IPv6/123USToo specific

A flag is an observation, not an accusation. Very large and very specific prefixes are both legitimate in the right context.