🌐 Reverse ASN Lookup

Find all domains hosted on this ASN

Every .dk domain whose website address (A record) is announced by AS12731, 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
14141516162026-07-012026-08-242026-10-18
15 latest0 over 110 days

Active .dk domains whose website address (A record) is announced by AS12731, counted once a day.

🌐 AS12731 at a glance#

IPHH Internet Port Hamburg GmbH

AS12731 is announced by IPHH Internet Port Hamburg GmbH (Germany) and currently hosts 15 .dk domains in our dataset — <0.01% of all scanned .dk domains. Across all our scans we have observed 6 unique IPv4 addresses on this network, and the domains currently sit in 3 IPv4 CIDR blocks covering roughly 10.5 thousand addresses of IPv4 space.

IPv6 is live here too: 4 domains (26.7%) publish AAAA records from this AS, resolving to 2 unique IPv6 addresses across 2 prefixes (about 34.4 billion /64 networks of space).

The network is part of the .dk zone's infrastructure too: 2 distinct nameservers and 5 distinct 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 AS12731#

via ipbot.dk

IPHH Internet Port Hamburg GmbH announces 16 prefixes (11 IPv4, 5 IPv6) and reaches the internet through 10 upstream networks.

UpstreamNamePower
AS5405INTERDOTLINK Inter.link GmbH
100.0%
AS33891Core-Backbone GmbH
69.4%
AS3223Voxility LLP
31.8%
AS174Cogent Communications, LLC
29.3%
AS6939Hurricane Electric LLC
28.0%
AS3320DTAG Deutsche Telekom AG
3.7%
AS34019Hivane Association
3.4%
AS29632NASSIST-AS Netassist International EOOD
3.1%
AS34549meerfarbig GmbH & Co. KG
2.7%
AS34927iFog GmbH
2.5%

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

🔻 Networks using AS12731 as upstream#

2 networks
NetworkNameDomainsPower
AS13157GOPAS Solutions GmbH—
100.0%
AS206813AS4830org 4830.org e. V.—
24.8%

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#

5 CIDRs

🧭 Nameservers in this AS#

2 hosts
HostnameDomains
ns1.iphh.de 15
ns2.iphh.de 15

📮 Mail Exchangers in this AS#

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