asn.dev

Address space

AS1103 SURFNET-NL SURFnet, The Netherlands

Unclassified RIPE Educational/Research

IPv4 prefixes 142 7.19M addresses
IPv6 prefixes 14
Most common size /16 IPv4
Flagged 11

Shape

IPv4 prefix sizes

All IPv4
/12
/12: 2
2
/14
/14: 3
3
/15
/15: 7
7
/16
/16: 42
42
/17
/17: 10
10
/18
/18: 11
11
/19
/19: 8
8
/20
/20: 7
7
/21
/21: 10
10
/22
/22: 9
9
/23
/23: 10
10
/24
/24: 12
12
/25
/25: 2
2
/26
/26: 2
2
/27
/27: 2
2
/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
/30
/30: 1
1
/31
/31: 1
1
/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
/48
/48: 2
2

Geography

Where the space lands

CountryNamePrefixes
NLNetherlands156

Review

Flagged prefixes

11 of 156
PrefixFamilyAddressesCountryFlags
192.42.115.0/26IPv464NLToo specific
192.42.115.64/27IPv432NLToo specific
192.42.115.96/30IPv44NLToo specific
192.42.115.100/31IPv42NLToo specific
192.42.115.103/32IPv41NLToo specific
192.42.115.104/29IPv48NLToo specific
192.42.115.112/28IPv416NLToo specific
192.42.115.128/25IPv4128NLToo specific
195.169.142.32/27IPv432NLToo specific
195.169.142.64/26IPv464NLToo specific
195.169.142.128/25IPv4128NLToo specific

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