Autonomous System

AS1103 SURF B.V.

ISPActiveNetherlandsRIPE

AS1103 (SURFNET-NL) is an ISP network operated by SURF B.V. in Netherlands, registered with RIPE. It has 98 IPv4 prefixes with 7,217,408 addresses and 4 IPv6 prefixes, which makes it the 96th largest of 82,534 active autonomous systems by IPv4 space.

IPv4 addresses7,217,408in 98 prefixes
IPv6 prefixes4≈ 6.3 × 10²⁹ addresses
Size rank#96of 82,534 active ASNs
Abuser scoreVery Lowunder 0.01% of its addresses flagged · method

Details

OrganizationSURF B.V.
AS nameSURFNET-NL
Websitesurf.nl
Country Netherlands (NL)
Network typeISP
RegistryRIPE
Abuse contactcert@surfcert.nl
Registered2002-09-23
Last updated2026-09-25

IPv4 prefixes

98 prefixes · 7,217,408 addresses
NetworkAddressesFirst – last address
145.144.0.0/121,048,576145.144.0.0 – 145.159.255.255
145.160.0.0/121,048,576145.160.0.0 – 145.175.255.255
145.120.0.0/14262,144145.120.0.0 – 145.123.255.255
145.140.0.0/14262,144145.140.0.0 – 145.143.255.255
145.2.0.0/15131,072145.2.0.0 – 145.3.255.255
145.28.0.0/15131,072145.28.0.0 – 145.29.255.255
145.38.0.0/15131,072145.38.0.0 – 145.39.255.255
145.48.0.0/15131,072145.48.0.0 – 145.49.255.255
145.74.0.0/15131,072145.74.0.0 – 145.75.255.255
145.88.0.0/15131,072145.88.0.0 – 145.89.255.255
145.92.0.0/15131,072145.92.0.0 – 145.93.255.255
145.100.0.0/15131,072145.100.0.0 – 145.101.255.255
145.124.0.0/15131,072145.124.0.0 – 145.125.255.255
145.136.0.0/15131,072145.136.0.0 – 145.137.255.255
129.125.0.0/1665,536129.125.0.0 – 129.125.255.255
130.37.0.0/1665,536130.37.0.0 – 130.37.255.255
131.174.0.0/1665,536131.174.0.0 – 131.174.255.255
131.211.0.0/1665,536131.211.0.0 – 131.211.255.255
131.224.0.0/1665,536131.224.0.0 – 131.224.255.255
132.229.0.0/1665,536132.229.0.0 – 132.229.255.255
134.221.0.0/1665,536134.221.0.0 – 134.221.255.255
136.231.0.0/1665,536136.231.0.0 – 136.231.255.255
137.56.0.0/1665,536137.56.0.0 – 137.56.255.255
137.120.0.0/1665,536137.120.0.0 – 137.120.255.255
137.224.0.0/1665,536137.224.0.0 – 137.224.255.255
The 25 largest of 98. The API and the database have all of them.

IPv6 prefixes

4 prefixes
  • 2001:610::/29
  • 2001:678:1334::/48
  • 2001:67c:1200::/48
  • 2001:67c:262c::/48

Query AS1103 with the API

The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day. 

curl "https://api.ipapi.is/?q=AS1103&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS1103, with or without a key:

curl "https://api.ipapi.is/?q=145.144.0.1"

Other networks of SURF B.V.

6 of 7
AS1101 SURF B.V.1,773,056 IPv4 addressesAS1128 SURF B.V.196,608 IPv4 addressesAS1161 SURF B.V.69,632 IPv4 addressesAS1106 SURF B.V.65,792 IPv4 addressesAS1133 SURF B.V.65,536 IPv4 addressesAS1199 SURF B.V.65,536 IPv4 addresses

Largest networks in Netherlands

AS20940 Akamai International B.V.15,601,408 IPv4 addressesAS33915 Vodafone Libertel B.V.12,032,512 IPv4 addressesAS1136 KPN B.V.7,316,992 IPv4 addressesAS50266 Odido Netherlands B.V.2,331,392 IPv4 addressesAS6830 Liberty Global Europe Holding B.V.2,098,432 IPv4 addressesAS1101 SURF B.V.1,773,056 IPv4 addresses