asn.dev

Address space

AS18558 NETBLK-RCOEK

Unclassified ARIN

IPv4 prefixes 125 72.20K addresses
IPv6 prefixes 5
Most common size /24 IPv4
Flagged 63

Shape

IPv4 prefix sizes

All IPv4
/19
/19: 1
1
/20
/20: 5
5
/21
/21: 5
5
/22
/22: 16
16
/23
/23: 17
17
/24
/24: 22
22
/25
/25: 10
10
/26
/26: 12
12
/27
/27: 9
9
/28
/28: 9
9
/29
/29: 8
8
/30
/30: 4
4
/31
/31: 5
5
/32
/32: 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
/122
/122: 2
2
/123
/123: 2
2

Geography

Where the space lands

CountryNamePrefixes
USUnited States of America130

Review

Flagged prefixes

63 of 130
PrefixFamilyAddressesCountryFlags
137.164.1.110/31IPv42USToo specific
137.164.1.236/30IPv44USToo specific
137.164.3.16/31IPv42USToo specific
137.164.13.36/30IPv44USToo specific
204.100.37.0/29IPv48USToo specific
204.100.37.8/29IPv48USToo specific
204.100.37.16/28IPv416USToo specific
204.100.37.32/27IPv432USToo specific
204.100.37.64/26IPv464USToo specific
204.100.37.128/25IPv4128USToo specific
204.100.64.0/29IPv48USToo specific
204.100.64.8/31IPv42USToo specific
204.100.64.10/31IPv42USToo specific
204.100.64.12/30IPv44USToo specific
204.100.64.16/28IPv416USToo specific
204.100.64.32/27IPv432USToo specific
204.100.64.64/26IPv464USToo specific
204.100.64.128/25IPv4128USToo specific
204.100.84.0/25IPv4128USToo specific
204.100.84.128/26IPv464USToo specific
204.100.84.192/26IPv464USToo specific
204.100.169.0/26IPv464USToo specific
204.100.169.64/29IPv48USToo specific
204.100.169.72/29IPv48USToo specific
204.100.169.80/28IPv416USToo specific

The first 25. Every flag also shows in the IPv4 and IPv6 lists.

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