asn.dev

Address space

AS54113 FASTLY

Hosting ARIN Content

IPv4 prefixes 301 375K addresses
IPv6 prefixes 1,029
Most common size /24 IPv4
Flagged 61

Shape

IPv4 prefix sizes

All IPv4
/18
/18: 6
6
/19
/19: 8
8
/20
/20: 10
10
/21
/21: 31
31
/22
/22: 58
58
/23
/23: 45
45
/24
/24: 82
82
/25
/25: 15
15
/26
/26: 16
16
/27
/27: 10
10
/28
/28: 20
20

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
/34
/34: 1
1
/35
/35: 4
4
/36
/36: 5
5
/37
/37: 4
4
/38
/38: 10
10
/39
/39: 8
8
/40
/40: 14
14
/41
/41: 9
9
/42
/42: 16
16
/43
/43: 18
18
/44
/44: 145
145
/45
/45: 67
67
/46
/46: 74
74
/47
/47: 189
189
/48
/48: 465
465

Geography

Where the space lands

CountryNamePrefixes
USUnited States of America1,330

Review

Flagged prefixes

61 of 1,330
PrefixFamilyAddressesCountryFlags
104.156.92.0/25IPv4128USToo specific
104.156.92.128/26IPv464USToo specific
104.156.92.192/27IPv432USToo specific
104.156.92.224/28IPv416USToo specific
104.156.92.240/28IPv416USToo specific
140.248.67.0/25IPv4128USToo specific
140.248.67.128/26IPv464USToo specific
140.248.67.192/27IPv432USToo specific
140.248.67.224/28IPv416USToo specific
140.248.67.240/28IPv416USToo specific
140.248.73.0/25IPv4128USToo specific
140.248.73.128/26IPv464USToo specific
140.248.73.192/27IPv432USToo specific
140.248.73.224/28IPv416USToo specific
140.248.73.240/28IPv416USToo specific
140.248.83.0/25IPv4128USToo specific
140.248.83.128/26IPv464USToo specific
140.248.83.192/27IPv432USToo specific
140.248.83.224/28IPv416USToo specific
140.248.83.240/28IPv416USToo specific
140.248.86.0/25IPv4128USToo specific
140.248.86.128/26IPv464USToo specific
140.248.86.192/27IPv432USToo specific
140.248.86.224/28IPv416USToo specific
140.248.86.240/28IPv416USToo specific

The first 25. Every flag also shows in the IPv4 and IPv6 lists.

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