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 3 IPv6 prefixes, which makes it the 96th largest of 82,141 active autonomous systems by IPv4 space.
IPv4 addresses7,217,408in 98 prefixes
IPv6 prefixes3≈ 6.3 × 10²⁹ addresses
Size rank#96of 82,141 active ASNs
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| Network | Addresses | First – last address |
|---|---|---|
| 145.144.0.0/12 | 1,048,576 | 145.144.0.0 – 145.159.255.255 |
| 145.160.0.0/12 | 1,048,576 | 145.160.0.0 – 145.175.255.255 |
| 145.120.0.0/14 | 262,144 | 145.120.0.0 – 145.123.255.255 |
| 145.140.0.0/14 | 262,144 | 145.140.0.0 – 145.143.255.255 |
| 145.2.0.0/15 | 131,072 | 145.2.0.0 – 145.3.255.255 |
| 145.28.0.0/15 | 131,072 | 145.28.0.0 – 145.29.255.255 |
| 145.38.0.0/15 | 131,072 | 145.38.0.0 – 145.39.255.255 |
| 145.48.0.0/15 | 131,072 | 145.48.0.0 – 145.49.255.255 |
| 145.74.0.0/15 | 131,072 | 145.74.0.0 – 145.75.255.255 |
| 145.88.0.0/15 | 131,072 | 145.88.0.0 – 145.89.255.255 |
| 145.92.0.0/15 | 131,072 | 145.92.0.0 – 145.93.255.255 |
| 145.100.0.0/15 | 131,072 | 145.100.0.0 – 145.101.255.255 |
| 145.124.0.0/15 | 131,072 | 145.124.0.0 – 145.125.255.255 |
| 145.136.0.0/15 | 131,072 | 145.136.0.0 – 145.137.255.255 |
| 129.125.0.0/16 | 65,536 | 129.125.0.0 – 129.125.255.255 |
| 130.37.0.0/16 | 65,536 | 130.37.0.0 – 130.37.255.255 |
| 131.174.0.0/16 | 65,536 | 131.174.0.0 – 131.174.255.255 |
| 131.211.0.0/16 | 65,536 | 131.211.0.0 – 131.211.255.255 |
| 131.224.0.0/16 | 65,536 | 131.224.0.0 – 131.224.255.255 |
| 132.229.0.0/16 | 65,536 | 132.229.0.0 – 132.229.255.255 |
| 134.221.0.0/16 | 65,536 | 134.221.0.0 – 134.221.255.255 |
| 136.231.0.0/16 | 65,536 | 136.231.0.0 – 136.231.255.255 |
| 137.56.0.0/16 | 65,536 | 137.56.0.0 – 137.56.255.255 |
| 137.120.0.0/16 | 65,536 | 137.120.0.0 – 137.120.255.255 |
| 137.224.0.0/16 | 65,536 | 137.224.0.0 – 137.224.255.255 |
145.144.0.0/12 145.160.0.0/12 145.120.0.0/14 145.140.0.0/14 145.2.0.0/15 145.28.0.0/15 145.38.0.0/15 145.48.0.0/15 145.74.0.0/15 145.88.0.0/15 145.92.0.0/15 145.100.0.0/15 145.124.0.0/15 145.136.0.0/15 129.125.0.0/16 130.37.0.0/16 131.174.0.0/16 131.211.0.0/16 131.224.0.0/16 132.229.0.0/16 134.221.0.0/16 136.231.0.0/16 137.56.0.0/16 137.120.0.0/16 137.224.0.0/16
The 25 largest of 98. The API and the database have all of them.
IPv6 prefixes
3 prefixes- 2001:610::/29
- 2001:67c:1200::/48
- 2001:67c:262c::/48
2001:610::/29 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.
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 addressesAS1147 SURF B.V.35,328 IPv4 addresses
Largest networks in Netherlands
AS20940 Akamai International B.V.15,599,104 IPv4 addressesAS33915 Vodafone Libertel B.V.12,032,512 IPv4 addressesAS1136 KPN B.V.7,316,992 IPv4 addressesAS50266 Odido Netherlands B.V.2,200,320 IPv4 addressesAS6830 Liberty Global Europe Holding B.V.2,100,224 IPv4 addressesAS1101 SURF B.V.1,773,056 IPv4 addresses