🌐 Reverse ASN Lookup

Find all domains hosted on this ASN

Every .dk domain whose website address (A record) is announced by AS20811, 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#

109 days
112332026-07-012026-08-242026-10-17
2 latest0 over 109 days

Active .dk domains whose website address (A record) is announced by AS20811, counted once a day.

🌐 AS20811 at a glance#

Retelit Digital Services S.p.A.

AS20811 is announced by Retelit Digital Services S.p.A. (Italy) and currently hosts 2 .dk domains in our dataset — <0.01% of all scanned .dk domains. Across all our scans we have observed 2 unique IPv4 addresses on this network, and the domains currently sit in 2 IPv4 CIDR blocks covering roughly 24.6 thousand addresses of IPv4 space.

We have yet to observe any IPv6 (AAAA) hosting on this AS.

The network is part of the .dk zone's infrastructure too: 3 distinct nameservers and no mail exchangers serving .dk domains currently resolve to addresses announced by this AS.

On the security side, 0 of the domains hosted here (0.0%) 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 AS20811#

via ipbot.dk

BRENNERCOM-AS Retelit Digital Services S.p.A. announces 16 prefixes (14 IPv4, 2 IPv6) and reaches the internet through 10 upstream networks.

UpstreamNamePower
AS28716Retelit Digital Services S.p.A.
100.0%
AS6939Hurricane Electric LLC
40.3%
AS9002RETN Limited
11.6%
AS3303Swisscom (Schweiz) AG
0.4%
AS13030Init7 (Switzerland) Ltd.
0.3%
AS24961MYLOC-AS WIIT AG
0.2%
AS216265ARISTO NETWORKS LTD
0.0%
AS48362TKSWF-AS Stadtwerke Feldkirch
0.0%
AS22356Durand do Brasil Ltda
0.0%
AS9009M247 M247 Europe SRL
0.0%

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

🔻 Networks using AS20811 as upstream#

1 network
NetworkNameDomainsPower
AS50178Limitis s.r.l.—
100.0%

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#

2 CIDRs

🧭 Nameservers in this AS#

3 hosts
dhd.dk [/] search Domains, Hosts & DNS — .dk zone