asn.dev

Address space

AS20001 TWC-20001-PACWEST

Residential DROP-listed space ARIN Cable/DSL/ISP

IPv4 prefixes 622 7.22M addresses
IPv6 prefixes 159
Most common size /23 IPv4
Flagged 19

Shape

IPv4 prefix sizes

All IPv4
/13
/13: 1
1
/14
/14: 8
8
/15
/15: 9
9
/16
/16: 14
14
/17
/17: 24
24
/18
/18: 45
45
/19
/19: 44
44
/20
/20: 76
76
/21
/21: 61
61
/22
/22: 71
71
/23
/23: 135
135
/24
/24: 134
134

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
/28
/28: 1
1
/32
/32: 1
1
/33
/33: 2
2
/34
/34: 5
5
/35
/35: 3
3
/36
/36: 6
6
/37
/37: 5
5
/38
/38: 5
5
/39
/39: 9
9
/40
/40: 10
10
/41
/41: 10
10
/42
/42: 10
10
/43
/43: 9
9
/44
/44: 13
13
/45
/45: 11
11
/46
/46: 10
10
/47
/47: 13
13
/48
/48: 17
17
/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
/63
/63: 2
2
/64
/64: 4
4

Geography

Where the space lands

CountryNamePrefixes
USUnited States of America781

Review

Flagged prefixes

19 of 781
PrefixFamilyAddressesCountryFlags
2605:e000:300::/64IPv6/64USToo specific
2605:e000:300:1::/64IPv6/64USToo specific
2605:e000:300:2::/63IPv6/63USToo specific
2605:e000:300:4::/64IPv6/64USToo specific
2605:e000:300:5::/64IPv6/64USToo specific
2605:e000:300:6::/63IPv6/63USToo specific
2605:e000:300:8::/61IPv6/61USToo specific
2605:e000:300:10::/60IPv6/60USToo specific
2605:e000:300:20::/59IPv6/59USToo specific
2605:e000:300:40::/58IPv6/58USToo specific
2605:e000:300:80::/57IPv6/57USToo specific
2605:e000:300:100::/56IPv6/56USToo specific
2605:e000:300:200::/55IPv6/55USToo specific
2605:e000:300:400::/54IPv6/54USToo specific
2605:e000:300:800::/53IPv6/53USToo specific
2605:e000:300:1000::/52IPv6/52USToo specific
2605:e000:300:2000::/51IPv6/51USToo specific
2605:e000:300:4000::/50IPv6/50USToo specific
2605:e000:300:8000::/49IPv6/49USToo specific

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