asn.dev

Address space

AS600 OARNET-AS

Unclassified ARIN

IPv4 prefixes 269 900K addresses
IPv6 prefixes 2
Most common size /24 IPv4
Flagged 9

Shape

IPv4 prefix sizes

All IPv4
/16
/16: 3
3
/17
/17: 4
4
/18
/18: 9
9
/19
/19: 15
15
/20
/20: 32
32
/21
/21: 40
40
/22
/22: 45
45
/23
/23: 52
52
/24
/24: 60
60
/25
/25: 2
2
/26
/26: 2
2
/27
/27: 2
2
/28
/28: 1
1
/29
/29: 1
1
/30
/30: 1
1

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: 2
2

Geography

Where the space lands

CountryNamePrefixes
USUnited States of America271

Review

Flagged prefixes

9 of 271
PrefixFamilyAddressesCountryFlags
131.187.185.32/27IPv432USToo specific
131.187.185.64/26IPv464USToo specific
131.187.185.128/25IPv4128USToo specific
199.18.168.0/29IPv48USToo specific
199.18.168.8/30IPv44USToo specific
199.18.168.16/28IPv416USToo specific
199.18.168.32/27IPv432USToo specific
199.18.168.64/26IPv464USToo specific
199.18.168.128/25IPv4128USToo specific

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