Sign inMonitor a domain
AS1101

AS1101 is SURF B.V..

Last updated 3 Nov 2026 from DB-IP ASN Lite (2026-11-01) and RIR statistics (4 Nov 2026)

Short answer

AS1101 belongs to SURF B.V.. DB-IP Lite attributes 1,904,128 IPv4 addresses in 12 ranges and 3 IPv6 ranges to it, all or nearly all of the IPv4 space in Netherlands. The number is registered with RIPE NCC in Netherlands on 1 Sept 1993.

Facts for AS1101
Operator (DB-IP)SURF B.V.
IPv4 addresses1,904,128
IPv4 ranges12
IPv6 ranges3
RegistryRIPE NCC
Registered1 Sept 1993
Registry countryNetherlands (NL)

Does it publish a geofeed?

We haven’t checked this network’s registry records for a geofeed yet. The Truth Check looks for one live for any address you test.

Shared addresses (CGNAT)

SURF B.V. hasn’t been documented as using carrier-grade NAT in a source we could check. To see whether your own connection is behind it, compare your router’s address on the CGNAT check.

IPv6

DB-IP lists 3 IPv6 ranges for AS1101, so customers can get IPv6 addresses, which databases place separately from IPv4.

Where its IPv4 space is used, according to DB-IP

NL100%

Share of the network’s IPv4 addresses by DB-IP Country Lite. IP Geolocation by DB-IP.

IP ranges

RangeAs CIDRAddresses
44.137.0.0 – 44.137.255.25544.137.0.0/1665,536
145.99.0.0 – 145.99.255.255145.99.0.0/1665,536
145.102.4.0 – 145.102.5.255145.102.4.0/23512
145.192.0.0 – 145.217.255.255145.192.0.0/12, 145.208.0.0/13 …1,703,936
145.220.0.0 – 145.220.255.255145.220.0.0/1665,536
185.17.73.0 – 185.17.73.255185.17.73.0/24256
185.100.59.0 – 185.100.59.255185.100.59.0/24256
192.12.54.0 – 192.12.54.255192.12.54.0/24256
192.16.200.0 – 192.16.200.255192.16.200.0/24256
192.42.117.0 – 192.42.119.255192.42.117.0/24, 192.42.118.0/23768
192.42.128.0 – 192.42.131.255192.42.128.0/221,024
192.150.94.0 – 192.150.94.255192.150.94.0/24256
2001:67c:6ec:: – 2001:67c:6ec:ffff:ffff:ffff:ffff:ffff2001:67c:6ec::/48IPv6
2001:67c:12d8:: – 2001:67c:12d8:ffff:ffff:ffff:ffff:ffff2001:67c:12d8::/48IPv6
2a04:601:: – 2a04:601:ffff:ffff:ffff:ffff:ffff:ffff2a04:601::/32IPv6
Showing 12 of 12 IPv4 and 3 of 3 IPv6 ranges All ranges (CSV)

IP Geolocation by DB-IP, ASN Lite, CC BY 4.0.

Using an address from this network? See which sources agree on where it is.

Sources

  1. DB-IP IP to ASN Lite (CC BY 4.0) · checked 3 Nov 2026
  2. NRO RIR delegated-extended statistics · checked 5 Nov 2026