$ query “AS1103” --type=asn → 1 result(s)

AS1103 · SURFNET-NL

SURF B.V.

AS1103 is operated by SURF B.V. and serves as a mid-size transit provider, registered in the Netherlands since 2002. The system announces an impressive 7.2 million IPv4 addresses, including a /12, and supports IPv6. Most of its address space is geolocated to the Netherlands.

  • Top 5% — Top 5% of all autonomous systems by reach and degree

Basic Information

Country
🇳🇱 Netherlands
Category
Hosting
Network Role
Mid-size Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
September 23, 2002
Last Changed
March 04, 2026
Last Seen
June 27, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
100 / 85
IPv6 Prefixes (raw / aggregated)
3 / 3
IPv4 Addresses
7 204 096
Largest IPv4 Prefix
/12 (1 048 576 addresses)
Largest IPv6 Prefix
/29
Geolocated Countries
🇳🇱 Netherlands (11 760 640 IPs)
Prefix Changed
March 04, 2026

Reputation

Reputation
Good — 1 flagged IPs out of 7 204 096 total (0.00%)

Connectivity Summary

Upstream Providers
7 upstreams providing transit
Peers
1 068 networks exchanging traffic without transit
Downstream Customers
24 downstreams buying transit
Unclassified
34 unclassified BGP neighbors
Degree
1 133 unique BGP neighbors
Reach
27 networks in customer cone

Upstream Providers (7)

  • AS3257 — GTT-BACKBONE (Tier-1 transit)
  • AS7575 — AARNET-AS-AP
  • AS6830 — LIBERTYGLOBAL (Tier-1 transit)
  • AS24785 — JOINTTRANSIT-AS
  • AS11537 — INTERNET2-RESEARCH-EDU
  • AS20965 — GEANT
  • AS20562 — OPEN-PEERING-AS (Tier-1 transit)

Prefix Lists

IPv4 Prefixes (100 total)

  • 145.144.0.0/12 (1 048 576 addresses (/12 prefix))
  • 145.160.0.0/12 (1 048 576 addresses (/12 prefix))
  • 145.120.0.0/14 (262 144 addresses (/14 prefix))
  • 145.140.0.0/14 (262 144 addresses (/14 prefix))
  • 145.100.0.0/14 (262 144 addresses (/14 prefix))
  • 145.88.0.0/14 (262 144 addresses (/14 prefix))
  • 145.136.0.0/15 (131 072 addresses (/15 prefix))
  • 145.124.0.0/15 (131 072 addresses (/15 prefix))
  • 145.2.0.0/15 (131 072 addresses (/15 prefix))
  • 145.92.0.0/15 (131 072 addresses (/15 prefix))
  • 145.74.0.0/15 (131 072 addresses (/15 prefix))
  • 145.48.0.0/15 (131 072 addresses (/15 prefix))
  • 145.38.0.0/15 (131 072 addresses (/15 prefix))
  • 145.28.0.0/15 (131 072 addresses (/15 prefix))
  • 156.83.0.0/16 (65 536 addresses (/16 prefix))
  • 137.56.0.0/16 (65 536 addresses (/16 prefix))
  • 145.0.0.0/16 (65 536 addresses (/16 prefix))
  • 145.5.0.0/16 (65 536 addresses (/16 prefix))
  • 145.9.0.0/16 (65 536 addresses (/16 prefix))
  • 145.19.0.0/16 (65 536 addresses (/16 prefix))
  • 145.20.0.0/16 (65 536 addresses (/16 prefix))
  • 145.23.0.0/16 (65 536 addresses (/16 prefix))
  • 145.24.0.0/16 (65 536 addresses (/16 prefix))
  • 143.121.0.0/16 (65 536 addresses (/16 prefix))
  • 145.33.0.0/16 (65 536 addresses (/16 prefix))
  • 145.37.0.0/16 (65 536 addresses (/16 prefix))
  • 141.252.0.0/16 (65 536 addresses (/16 prefix))
  • 145.41.0.0/16 (65 536 addresses (/16 prefix))
  • 145.44.0.0/16 (65 536 addresses (/16 prefix))
  • 139.63.0.0/16 (65 536 addresses (/16 prefix))
  • 145.51.0.0/16 (65 536 addresses (/16 prefix))
  • 145.52.0.0/16 (65 536 addresses (/16 prefix))
  • 137.224.0.0/16 (65 536 addresses (/16 prefix))
  • 145.76.0.0/16 (65 536 addresses (/16 prefix))
  • 145.81.0.0/16 (65 536 addresses (/16 prefix))
  • 145.85.0.0/16 (65 536 addresses (/16 prefix))
  • 137.120.0.0/16 (65 536 addresses (/16 prefix))
  • 131.211.0.0/16 (65 536 addresses (/16 prefix))
  • 145.95.0.0/16 (65 536 addresses (/16 prefix))
  • 145.96.0.0/16 (65 536 addresses (/16 prefix))
  • 195.169.0.0/16 (65 536 addresses (/16 prefix))
  • 194.171.0.0/16 (65 536 addresses (/16 prefix))
  • 192.87.0.0/16 (65 536 addresses (/16 prefix))
  • 145.138.0.0/16 (65 536 addresses (/16 prefix))
  • 145.98.0.0/16 (65 536 addresses (/16 prefix))
  • 136.231.0.0/16 (65 536 addresses (/16 prefix))
  • 145.107.0.0/16 (65 536 addresses (/16 prefix))
  • 145.108.0.0/16 (65 536 addresses (/16 prefix))
  • 129.125.0.0/16 (65 536 addresses (/16 prefix))
  • 131.224.0.0/16 (65 536 addresses (/16 prefix))

IPv6 Prefixes (3 total)

  • 2001:610::/29
  • 2001:67c:1200::/48
  • 2001:67c:262c::/48