asn.dev

Address space

AS9 CMU-ROUTER

IPv4 prefixes 9 134K addresses
IPv6 prefixes 16
Most common size /24 IPv4
Flagged 1

Shape

Prefix sizes

IPv4
/16
/16: 2
2
/22
/22: 1
1
/23
/23: 1
1
/24
/24: 4
4
/31
/31: 1
1

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
/33
/33: 1
1
/34
/34: 1
1
/35
/35: 1
1
/36
/36: 1
1
/37
/37: 1
1
/38
/38: 1
1
/39
/39: 1
1
/40
/40: 1
1
/41
/41: 1
1
/42
/42: 1
1
/43
/43: 1
1
/44
/44: 1
1
/45
/45: 1
1
/46
/46: 1
1
/47
/47: 1
1
/48
/48: 1
1

Geography

Where the space lands

CountryNamePrefixes
USUnited States of America25

Review

Flagged prefixes

1 of 25
PrefixFamilyAddressesCountryFlags
137.164.1.144/31IPv42USToo 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

25 total
PrefixFamilyAddressesCountryFlags
128.2.0.0/16IPv465,536US
128.237.0.0/16IPv465,536US
137.164.1.144/31IPv42USToo specific
192.5.146.0/24IPv4256US
192.12.32.0/24IPv4256US
192.58.107.0/24IPv4256US
192.80.210.0/24IPv4256US
204.194.28.0/22IPv41,024US
209.129.244.0/23IPv4512US
2607:fb28::/44IPv6—US
2607:fb28:11::/48IPv6—US
2607:fb28:12::/47IPv6—US
2607:fb28:14::/46IPv6—US
2607:fb28:18::/45IPv6—US
2607:fb28:20::/43IPv6—US
2607:fb28:40::/42IPv6—US
2607:fb28:80::/41IPv6—US
2607:fb28:100::/40IPv6—US
2607:fb28:200::/39IPv6—US
2607:fb28:400::/38IPv6—US
2607:fb28:800::/37IPv6—US
2607:fb28:1000::/36IPv6—US
2607:fb28:2000::/35IPv6—US
2607:fb28:4000::/34IPv6—US
2607:fb28:8000::/33IPv6—US