🌐 Reverse ASN Lookup

Find all domains hosted on this ASN

Every .dk domain whose website address (A record) is announced by AS33843, 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#

119 days
112332026-07-012026-08-292026-10-27
2 latest0 over 119 days

Active .dk domains whose website address (A record) is announced by AS33843, counted once a day.

🌐 AS33843 at a glance#

Dr.-Ing. Nepustil & Co. GmbH Internet Service Center Ingenieurgesellschaft fuer Systemsoftwa

AS33843 is announced by Dr.-Ing. Nepustil & Co. GmbH Internet Service Center Ingenieurgesellschaft fuer Systemsoftwa (Germany) 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 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 1 distinct mail exchanger 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 AS33843#

via ipbot.dk

NEPUSTILNET-AS02 Dr.-Ing. Nepustil & Co. GmbH Internet Service Center Ingenieurgesellschaft fuer Systemsoftware und Kommunikationstechnik announces 6 prefixes (4 IPv4, 2 IPv6) and reaches the internet through 10 upstream networks.

UpstreamNamePower
AS3320DTAG Deutsche Telekom AG
100.0%
AS1299TWELVE99 Arelion Sweden AB
85.6%
AS6939Hurricane Electric LLC
16.6%
AS33891Core-Backbone GmbH
6.1%
AS34549meerfarbig GmbH & Co. KG
5.4%
AS34019Hivane Association
4.7%
AS34927iFog GmbH
4.0%
AS14840BR.Digital Telecom
3.6%
AS48362TKSWF-AS Stadtwerke Feldkirch
3.6%
AS35280F5 F5 Networks SARL
3.2%

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

🔻 Networks using AS33843 as upstream#

3 networks
NetworkNameDomainsPower
AS12502NEPUSTILNET-AS01 Dr.-Ing. Nepustil & Co. GmbH Internet Service Center Ingenieurgesellschaft fuer Systemsoftware und Kommunikationstechnik—
100.0%
AS24766GBCNET-AS01 GBC GmbH Internet Service Center Ingenieurgesellschaft fuer Systemsoftware und Kommunikationstechnik—
3.4%
AS12374Unknown—
1.1%

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
85.236.192.0/19 2

🧭 Nameservers in this AS#

1 host
HostnameDomains
ns1.extdns.com 1

📮 Mail Exchangers in this AS#

1 host
HostnameDomains
mail.ntools.de 2
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