🌐 Reverse ASN Lookup

Find all domains hosted on this ASN

Every .dk domain whose website address (A record) is announced by AS21547, 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
223332026-07-012026-08-242026-10-17
2 latest-1 over 109 days

Active .dk domains whose website address (A record) is announced by AS21547, counted once a day.

🌐 AS21547 at a glance#

FirstLight Fiber, Inc.

AS21547 is announced by FirstLight Fiber, Inc. (United States) and currently hosts 2 .dk domains 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 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 no mail exchangers serving .dk domains currently resolve to addresses announced by this AS.

On the security side, 2 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 AS21547#

via ipbot.dk

OXNET - FirstLight Fiber, Inc. announces 61 prefixes (56 IPv4, 5 IPv6) and reaches the internet through 1 upstream network.

UpstreamNamePower
AS13536TVC-AS1 - FirstLight Fiber, Inc.
100.0%

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

📡 Known CIDRs#

1 CIDR
CIDRDomains
63.127.192.0/21 2

🧭 Nameservers in this AS#

1 host
HostnameDomains
aens2.aemaine.com 1
dhd.dk [/] search Domains, Hosts & DNS — .dk zone