asn.dev

Address space

AS3949 NTTA-3946 - NTT America, Inc.

Unclassified ARIN

IPv4 prefixes 32 11.52K addresses
IPv6 prefixes 16
Most common size /24 IPv4
Flagged 24

Shape

IPv4 prefix sizes

All IPv4
/21
/21: 1
1
/22
/22: 3
3
/23
/23: 4
4
/24
/24: 16
16
/25
/25: 1
1
/26
/26: 1
1
/28
/28: 2
2
/29
/29: 3
3
/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
/49
/49: 1
1
/50
/50: 1
1
/51
/51: 1
1
/52
/52: 1
1
/53
/53: 1
1
/54
/54: 1
1
/55
/55: 1
1
/56
/56: 1
1
/57
/57: 1
1
/58
/58: 1
1
/59
/59: 1
1
/60
/60: 1
1
/61
/61: 1
1
/62
/62: 1
1
/63
/63: 1
1
/64
/64: 1
1

Geography

Where the space lands

CountryNamePrefixes
USUnited States of America48

Review

Flagged prefixes

24 of 48
PrefixFamilyAddressesCountryFlags
81.93.189.64/29IPv48USToo specific
83.231.161.8/29IPv48USToo specific
103.13.83.144/28IPv416USToo specific
103.13.83.160/29IPv48USToo specific
202.68.66.76/30IPv44USToo specific
202.68.68.0/26IPv464USToo specific
202.68.75.80/28IPv416USToo specific
202.68.79.128/25IPv4128USToo specific
2407:a800:3e11::/52IPv6/52USToo specific
2407:a800:3e11:1000::/56IPv6/56USToo specific
2407:a800:3e11:1100::/60IPv6/60USToo specific
2407:a800:3e11:1110::/61IPv6/61USToo specific
2407:a800:3e11:1118::/63IPv6/63USToo specific
2407:a800:3e11:111b::/64IPv6/64USToo specific
2407:a800:3e11:111c::/62IPv6/62USToo specific
2407:a800:3e11:1120::/59IPv6/59USToo specific
2407:a800:3e11:1140::/58IPv6/58USToo specific
2407:a800:3e11:1180::/57IPv6/57USToo specific
2407:a800:3e11:1200::/55IPv6/55USToo specific
2407:a800:3e11:1400::/54IPv6/54USToo specific
2407:a800:3e11:1800::/53IPv6/53USToo specific
2407:a800:3e11:2000::/51IPv6/51USToo specific
2407:a800:3e11:4000::/50IPv6/50USToo specific
2407:a800:3e11:8000::/49IPv6/49USToo specific

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