🌐 Reverse ASN Lookup

Find all domains hosted on this ASN

Every .dk domain whose website address (A record) is announced by AS21263, 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
223442026-07-012026-08-242026-10-17
3 latest0 over 109 days

Active .dk domains whose website address (A record) is announced by AS21263, counted once a day.

🌐 AS21263 at a glance#

TeleData GmbH

AS21263 is announced by TeleData GmbH (Germany) and currently hosts 3 .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 1 IPv4 CIDR block covering roughly 8.2 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: 1 distinct nameserver and 3 distinct mail exchangers serving .dk domains currently resolve to addresses announced by this AS.

On the security side, 1 of the domains hosted here (33.3%) 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 AS21263#

via ipbot.dk

TeleData GmbH announces 46 prefixes (39 IPv4, 7 IPv6) and reaches the internet through 10 upstream networks.

UpstreamNamePower
AS6939Hurricane Electric LLC
100.0%
AS3356Level 3 Parent, LLC
54.9%
AS1299TWELVE99 Arelion Sweden AB
38.5%
AS3257GTT-BACKBONE GTT Communications Inc.
30.4%
AS58115SWISSIX-OUTREACH SwissIX Internet Exchange
20.5%
AS34549meerfarbig GmbH & Co. KG
4.0%
AS33891Core-Backbone GmbH
2.9%
AS5405INTERDOTLINK Inter.link GmbH
2.8%
AS12779IT.Gate S.p.A.
2.7%
AS14840BR.Digital Telecom
2.7%

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

🔻 Networks using AS21263 as upstream#

2 networks
NetworkNameDomainsPower
AS41504arcos informationssysteme GmbH—
100.0%
AS24766GBCNET-AS01 GBC GmbH Internet Service Center Ingenieurgesellschaft fuer Systemsoftware und Kommunikationstechnik—
10.1%

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#

1 CIDR
CIDRDomains
212.62.192.0/19 3

🧭 Nameservers in this AS#

1 host
HostnameDomains
auth02.ns.td-fn.net 9

📮 Mail Exchangers in this AS#

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