🌐 Reverse ASN Lookup

Find all domains hosted on this ASN

Every .dk domain whose website address (A record) is announced by AS43861, 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#

117 days
011222026-07-012026-08-282026-10-25
1 latest0 over 117 days

Active .dk domains whose website address (A record) is announced by AS43861, counted once a day.

🌐 AS43861 at a glance#

Circle B B.V.

AS43861 is announced by Circle B B.V. (The Netherlands) and currently hosts 1 .dk domain in our dataset — <0.01% of all scanned .dk domains. Across all our scans we have observed 1 unique IPv4 address on this network, and the domains currently sit in 1 IPv4 CIDR block covering roughly 256 addresses of IPv4 space.

We have yet to observe any IPv6 (AAAA) hosting on this AS.

We have not observed any nameservers or mail exchangers for .dk domains on this AS — the domains hosted here run their DNS and mail from other networks.

On the security side, 1 of the domains hosted here (100.0%) validate as DNSSEC-secure — well above 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 AS43861#

via ipbot.dk

CIRCLEB-ASN Circle B B.V. announces 6 prefixes (4 IPv4, 2 IPv6) and reaches the internet through 2 upstream networks.

UpstreamNamePower
AS8220COLT Technology Services Group Limited
100.0%
AS38930FIBERRING LeaseWeb Network B.V.
53.2%

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

🔻 Networks using AS43861 as upstream#

1 network
NetworkNameDomainsPower
AS209870Cylo Ltd—
100.0%

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.

Found 1 domain matching 43861
DomainIPASNISP / OrgCountry
mrit.dk 91.199.227.104 AS43861 Circle B B.V. 🇳🇱 The Netherlands

📡 Known CIDRs#

1 CIDR
CIDRDomains
91.199.227.0/24 1
dhd.dk [/] search Domains, Hosts & DNS — .dk zone