asn.dev

Address space

AS174 COGENT-174

Transit DROP-listed space ARIN NSP

IPv4 prefixes 9,909 24.66M addresses
IPv6 prefixes 1,372
Most common size /24 IPv4
Flagged 9

Shape

IPv4 prefix sizes

All IPv4
/14
/14: 3
3
/15
/15: 11
11
/16
/16: 62
62
/17
/17: 60
60
/18
/18: 226
226
/19
/19: 504
504
/20
/20: 684
684
/21
/21: 993
993
/22
/22: 1,638
1,638
/23
/23: 2,337
2,337
/24
/24: 3,382
3,382
/25
/25: 2
2
/26
/26: 1
1
/27
/27: 1
1
/28
/28: 1
1
/29
/29: 1
1
/30
/30: 1
1
/31
/31: 1
1
/32
/32: 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
/29
/29: 4
4
/30
/30: 2
2
/31
/31: 1
1
/32
/32: 9
9
/33
/33: 5
5
/34
/34: 7
7
/35
/35: 5
5
/36
/36: 9
9
/37
/37: 11
11
/38
/38: 19
19
/39
/39: 43
43
/40
/40: 73
73
/41
/41: 125
125
/42
/42: 126
126
/43
/43: 124
124
/44
/44: 121
121
/45
/45: 113
113
/46
/46: 134
134
/47
/47: 209
209
/48
/48: 232
232

Geography

Where the space lands

CountryNamePrefixes
USUnited States of America11,281

Review

Flagged prefixes

9 of 11,281
PrefixFamilyAddressesCountryFlags
38.96.169.0/25IPv4128USToo specific
38.229.72.0/28IPv416USToo specific
38.229.72.17/32IPv41USToo specific
38.229.72.18/31IPv42USToo specific
38.229.72.20/30IPv44USToo specific
38.229.72.24/29IPv48USToo specific
38.229.72.32/27IPv432USToo specific
38.229.72.64/26IPv464USToo specific
38.229.72.128/25IPv4128USToo specific

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