🌐 Reverse ASN Lookup

Find all domains hosted on this ASN

Every .dk domain whose website address (A record) is announced by AS5606, with the network's IPv6 and DNSSEC adoption and its observed prefixes. An autonomous system is the routing identity of a hosting company or ISP. Data comes from our own scanners, which re-resolve every .dk domain in the zone roughly once a week.

📈 Domains over time#

110 days
19202122232026-07-012026-08-242026-10-18
19 latest-3 over 110 days

Active .dk domains whose website address (A record) is announced by AS5606, counted once a day.

🌐 AS5606 at a glance#

GTS Telecom SRL

AS5606 is announced by GTS Telecom SRL (Romania) and currently hosts 19 .dk domains in our dataset — <0.01% of all scanned .dk domains. Across all our scans we have observed 24 unique IPv4 addresses on this network, and the domains currently sit in 14 IPv4 CIDR blocks covering roughly 39.2 thousand addresses of IPv4 space.

IPv6 is live here too: 3 domains (15.8%) publish AAAA records from this AS, resolving to 5 unique IPv6 addresses across 1 prefix (about 65.5 thousand /64 networks of space).

The network is part of the .dk zone's infrastructure too: 12 distinct nameservers and 18 distinct mail exchangers serving .dk domains currently resolve to addresses announced by this AS.

On the security side, 1 of the domains hosted here (5.3%) validate as DNSSEC-secure — below the zone-wide average for domains with a web address, 70.5%. See how this AS compares on the ASN statistics page, or drill into the CIDR list below the results.

🛰️ Upstream providers of AS5606#

via ipbot.dk

GTS-BACKBONE GTS Telecom SRL announces 135 prefixes (130 IPv4, 5 IPv6) and reaches the internet through 10 upstream networks.

UpstreamNamePower
AS1299TWELVE99 Arelion Sweden AB
100.0%
AS3356Level 3 Parent, LLC
63.7%
AS3257GTT-BACKBONE GTT Communications Inc.
60.3%
AS9002RETN Limited
55.4%
AS174Cogent Communications, LLC
49.3%
AS8708DIGI ROMANIA S.A.
39.6%
AS6762SEABONE-NET TELECOM ITALIA SPARKLE S.p.A.
34.3%
AS6939Hurricane Electric LLC
31.8%
AS12302Vodafone Romania S.A.
13.8%
AS13030Init7 (Switzerland) Ltd.
11.9%

Upstream and prefix data supplied by ipbot.dk; power is relative to the strongest upstream.

🔻 Networks using AS5606 as upstream#

5 networks
NetworkNameDomainsPower
AS58247NETVEILLANCE SC NETVEILLANCE SRL—
100.0%
AS44043Cyber_Folks-RO-DC_CLJ Cyber_Folks SRL17
67.4%
AS203053CLAUS WEB srl—
43.8%
AS58175AUTO-TOTAL-AS AD Auto Total SRL—
39.0%
AS211611Exim Host SRL—
37.1%

Among the networks we hold ipbot.dk routing data for (the ones looked up on this site), so this is a sample of the AS's customers, not all of them.

📡 Known CIDRs#

15 CIDRs

🧭 Nameservers in this AS#

12 hosts

📮 Mail Exchangers in this AS#

18 hosts
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