asn.dev

Address space

AS20057 ATT-MOBILITY-LLC-AS20057

Mobile ARIN

IPv4 prefixes 1,168 3.98M addresses
IPv6 prefixes 121
Most common size /23 IPv4
Flagged 0

Shape

IPv4 prefix sizes

All IPv4
/14
/14: 1
1
/15
/15: 3
3
/16
/16: 11
11
/17
/17: 12
12
/18
/18: 25
25
/19
/19: 56
56
/20
/20: 125
125
/21
/21: 187
187
/22
/22: 248
248
/23
/23: 254
254
/24
/24: 246
246

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
/37
/37: 5
5
/38
/38: 12
12
/39
/39: 32
32
/40
/40: 15
15
/41
/41: 37
37
/44
/44: 1
1
/45
/45: 1
1
/46
/46: 2
2
/47
/47: 8
8
/48
/48: 8
8

Geography

Where the space lands

CountryNamePrefixes
USUnited States of America1,289