asn.dev

Address space

AS31 CIT

IPv4 prefixes 16 132K addresses
IPv6 prefixes 4
Most common size /24 IPv4
Flagged 6

Shape

Prefix sizes

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
/29
/29: 1
1
/31
/31: 2
2

How this network carves its IPv4 space. 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

Prefix sizes

IPv6
/32
/32: 1
1
/121
/121: 1
1
/123
/123: 2
2

Geography

Where the space lands

CountryNamePrefixes
USUnited States of America20

Review

Flagged prefixes

6 of 20
PrefixFamilyAddressesCountryFlags
137.164.3.74/31IPv42USToo specific
137.164.3.204/31IPv42USToo specific
137.164.24.72/29IPv48USToo specific
2607:f380:1::118:9a40:34a0/123IPv6—USToo specific
2607:f380:1::118:9a40:3cc0/123IPv6—USToo specific
2607:f380:1::118:9a41:8480/121IPv6—USToo specific

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

Inventory

All prefixes

20 total
PrefixFamilyAddressesCountryFlags
131.215.0.0/17IPv432,768US
131.215.128.0/18IPv416,384US
131.215.192.0/19IPv48,192US
131.215.224.0/21IPv42,048US
131.215.232.0/23IPv4512US
131.215.234.0/24IPv4256US
131.215.235.0/24IPv4256US
131.215.236.0/22IPv41,024US
131.215.240.0/20IPv44,096US
134.4.0.0/16IPv465,536US
137.164.3.74/31IPv42USToo specific
137.164.3.204/31IPv42USToo specific
137.164.24.72/29IPv48USToo specific
192.12.19.0/24IPv4256US
192.31.43.0/24IPv4256US
192.41.208.0/24IPv4256US
2607:f380:1::118:9a40:34a0/123IPv6—USToo specific
2607:f380:1::118:9a40:3cc0/123IPv6—USToo specific
2607:f380:1::118:9a41:8480/121IPv6—USToo specific
2607:f520::/32IPv6—US