🌐 Reverse ASN Lookup

Find all domains hosted on this ASN

Every .dk domain whose website address (A record) is announced by AS43809, 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
17182021222026-07-012026-08-242026-10-17
17 latest-5 over 109 days

Active .dk domains whose website address (A record) is announced by AS43809, counted once a day.

🌐 AS43809 at a glance#

Forss IT AB

AS43809 is announced by Forss IT AB (Sweden) and currently hosts 17 .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 2 IPv4 CIDR blocks covering roughly 2.6 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: 2 distinct nameservers and 2 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 AS43809#

via ipbot.dk

Forss IT AB announces 6 prefixes (6 IPv4, 0 IPv6) and reaches the internet through 10 upstream networks.

UpstreamNamePower
AS202395FAB-NET Fiberaccessbolaget i Sverige AB
100.0%
AS1257SWIPNET - Tele2 Sverige AB
78.3%
AS6939Hurricane Electric LLC
16.8%
AS5405INTERDOTLINK Inter.link GmbH
7.6%
AS25091IP-Max SA
4.9%
AS35280F5 F5 Networks SARL
3.3%
AS20764RASCOM-AS CJSC RASCOM
2.7%
AS50304Blix Solutions AS
1.6%
AS4455BSO IX Reach Ltd
1.1%
AS13194BITE UAB "Bite Lietuva"
0.5%

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

📡 Known CIDRs#

2 CIDRs

🧭 Nameservers in this AS#

2 hosts
HostnameDomains
ns.forss.net 23
ns4.forss.net 23

📮 Mail Exchangers in this AS#

2 hosts
HostnameDomains
mx1.forss.net 15
mx2.forss.net 15
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