🌐 Reverse ASN Lookup

Find all domains hosted on this ASN

Every .dk domain whose website address (A record) is announced by AS15557, 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#

110 days
112332026-07-012026-08-242026-10-18
2 latest0 over 110 days

Active .dk domains whose website address (A record) is announced by AS15557, counted once a day.

🌐 AS15557 at a glance#

Societe Francaise Du Radiotelephone - SFR SA

AS15557 is announced by Societe Francaise Du Radiotelephone - SFR SA (France) and currently hosts 2 .dk domains in our dataset — <0.01% of all scanned .dk domains. Across all our scans we have observed 3 unique IPv4 addresses on this network, and the domains currently sit in 2 IPv4 CIDR blocks covering roughly 1.1 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: no nameservers and 4 distinct mail exchangers serving .dk domains currently resolve to addresses announced by this AS.

On the security side, 1 of the domains hosted here (50.0%) 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 AS15557#

via ipbot.dk

LDCOMNET Societe Francaise Du Radiotelephone - SFR SA announces 159 prefixes (147 IPv4, 12 IPv6) and reaches the internet through 10 upstream networks.

UpstreamNamePower
AS1299TWELVE99 Arelion Sweden AB
100.0%
AS6762SEABONE-NET TELECOM ITALIA SPARKLE S.p.A.
86.9%
AS174Cogent Communications, LLC
73.7%
AS2914NTT-DATA-2914 - NTT America, Inc.
59.0%
AS6939Hurricane Electric LLC
36.4%
AS9002RETN Limited
29.9%
AS1273CW Vodafone Group PLC
21.3%
AS3320DTAG Deutsche Telekom AG
15.8%
AS25091IP-Max SA
13.0%
AS6461Zayo Bandwidth
11.6%

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

🔻 Networks using AS15557 as upstream#

2 networks
NetworkNameDomainsPower
AS44297ICODIA SAS—
100.0%
AS15580Allianz Technology SE—
18.7%

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#

2 CIDRs
CIDRDomains
80.236.0.0/17 1
93.16.0.0/12 1

📮 Mail Exchangers in this AS#

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