asn.dev

Address space

AS8220 COLT COLT Technology Services Group Limited

Hosting RIPE NSP

IPv4 prefixes 278 1.49M addresses
IPv6 prefixes 32
Most common size /24 IPv4
Flagged 8

Shape

IPv4 prefix sizes

All IPv4
/16
/16: 3
3
/17
/17: 13
13
/18
/18: 22
22
/19
/19: 32
32
/20
/20: 25
25
/21
/21: 32
32
/22
/22: 37
37
/23
/23: 42
42
/24
/24: 64
64
/25
/25: 1
1
/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
/31
/31: 2
2
/32
/32: 1
1
/33
/33: 1
1
/34
/34: 1
1
/35
/35: 1
1
/36
/36: 1
1
/37
/37: 1
1
/38
/38: 1
1
/39
/39: 1
1
/40
/40: 1
1
/41
/41: 1
1
/42
/42: 1
1
/43
/43: 1
1
/44
/44: 1
1
/45
/45: 1
1
/46
/46: 1
1
/47
/47: 1
1
/48
/48: 14
14

Geography

Where the space lands

CountryNamePrefixes
GBUnited Kingdom310

Review

Flagged prefixes

8 of 310
PrefixFamilyAddressesCountryFlags
213.61.66.0/26IPv464GBToo specific
213.61.66.64/27IPv432GBToo specific
213.61.66.96/28IPv416GBToo specific
213.61.66.112/30IPv44GBToo specific
213.61.66.117/32IPv41GBToo specific
213.61.66.118/31IPv42GBToo specific
213.61.66.120/29IPv48GBToo specific
213.61.66.128/25IPv4128GBToo specific

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