asn.dev

Address space

AS257 DNIC-AS-00257

IPv4 prefixes 8 716 addresses
IPv6 prefixes 5
Most common size /24 IPv4
Flagged 10

Shape

Prefix sizes

IPv4
/24
/24: 2
2
/25
/25: 1
1
/26
/26: 1
1
/30
/30: 2
2
/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
/48
/48: 1
1
/122
/122: 2
2
/123
/123: 2
2

Geography

Where the space lands

CountryNamePrefixes
USUnited States of America13

Review

Flagged prefixes

10 of 13
PrefixFamilyAddressesCountryFlags
137.164.24.188/31IPv42USToo specific
137.164.50.148/30IPv44USToo specific
137.164.50.252/30IPv44USToo specific
204.102.228.128/25IPv4128USToo specific
204.102.230.112/31IPv42USToo specific
209.129.248.192/26IPv464USToo specific
2607:f380:1::108:9a41:8bc0/123IPv6—USToo specific
2607:f380:1::118:9a43:2940/122IPv6—USToo specific
2607:f380:1::118:9a43:2fc0/122IPv6—USToo specific
2607:f380:1::11c:c66e:6700/123IPv6—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

13 total
PrefixFamilyAddressesCountryFlags
137.164.24.188/31IPv42USToo specific
137.164.50.148/30IPv44USToo specific
137.164.50.252/30IPv44USToo specific
204.102.228.128/25IPv4128USToo specific
204.102.229.0/24IPv4256US
204.102.230.112/31IPv42USToo specific
205.155.65.0/24IPv4256US
209.129.248.192/26IPv464USToo specific
2607:f380:1::108:9a41:8bc0/123IPv6—USToo specific
2607:f380:1::118:9a43:2940/122IPv6—USToo specific
2607:f380:1::118:9a43:2fc0/122IPv6—USToo specific
2607:f380:1::11c:c66e:6700/123IPv6—USToo specific
2607:f380:804::/48IPv6—US