🌐 Reverse ASN Lookup

Find all domains hosted on this ASN

Every .dk domain whose website address (A record) is announced by AS12874, 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
667772026-07-012026-08-242026-10-17
6 latest-1 over 109 days

Active .dk domains whose website address (A record) is announced by AS12874, counted once a day.

🌐 AS12874 at a glance#

Fastweb

AS12874 is announced by Fastweb (Italy) and currently hosts 6 .dk domains in our dataset — <0.01% of all scanned .dk domains. Across all our scans we have observed 7 unique IPv4 addresses on this network, and the domains currently sit in 5 IPv4 CIDR blocks covering roughly 2.2 million 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: 2 distinct nameservers and 7 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 AS12874#

via ipbot.dk

Fastweb SpA announces 128 prefixes (110 IPv4, 18 IPv6) and reaches the internet through 10 upstream networks.

UpstreamNamePower
AS3303Swisscom (Schweiz) AG
100.0%
AS3356Level 3 Parent, LLC
53.9%
AS1299TWELVE99 Arelion Sweden AB
50.0%
AS6762SEABONE-NET TELECOM ITALIA SPARKLE S.p.A.
21.1%
AS9002RETN Limited
15.9%
AS13030Init7 (Switzerland) Ltd.
7.7%
AS34549meerfarbig GmbH & Co. KG
6.3%
AS6461Zayo Bandwidth
3.9%
AS39351ESAB-AS 31173 Services AB
2.9%
AS29075IELO-LIAZO SERVICES SAS
2.9%

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

🔻 Networks using AS12874 as upstream#

7 networks
NetworkNameDomainsPower
AS3573Accenture LLP—
100.0%
AS44512KONVERTO SPA—
62.9%
AS51580TIMENET SPA—
52.9%
AS200761Real Comm srl—
28.0%
AS60087ASSUPERNOVA Netsons s.r.l.19
19.4%
AS3242ASN-ITNET REEVO S.P.A.—
6.3%
AS202675Keliweb S.R.L—
6.1%

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#

5 CIDRs

🧭 Nameservers in this AS#

2 hosts
HostnameDomains
dns3.fastweb.it 5
dns4.fastweb.it 5

📮 Mail Exchangers in this AS#

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