AS8763 — DENIC-AS Theodor-Stern-Kai 1

AS8763 announces 4 IPv4 prefixes covering 3,840 addresses and 25 IPv6 prefixes.

About this network

DENIC eG (DENIC-AS) — the cooperative that operates .de, Germany's country-code top-level domain and one of the largest ccTLDs in the world. The Theodor-Stern-Kai 1 in the worklist handle is simply DENIC's street address in Frankfurt, not a company name.

What it's used for

• Running the .de registry: the authoritative nameservers for the zone, the registry systems German registrars talk to, and DENIC's own corporate infrastructure. rDNS on the space names exactly that — gw-dns1.denic.de, rt-cix-wms.denic.de.
• The whole inventory is one 81.91.160.0/20, roughly 4,000 addresses, plus an IPv6 /32.

Notable

• Registry / DNS infrastructure has no honest kind here. It is not hosting, not an ISP, not an enterprise network in any useful sense — it is critical naming infrastructure, so it is deliberately left out of every classification bucket rather than forced into one.
• The shape backs that up: about 4,000 addresses against roughly 144 observed BGP neighbours. That inversion — tiny address count, enormous peering surface — is what anycast DNS looks like. The same small blocks are announced from many locations so that a resolver's query reaches the nearest instance.
• Nothing behind these addresses is an end user. Geolocating them to Frankfurt is correct for the organisation and misleading for the traffic.

Interesting

• DENIC is a cooperative (eG), owned by its member registrars rather than by a company or the German state. Most large ccTLD registries are foundations, companies or government bodies; a member-owned co-op is unusual.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 81.91.160.0/22
• 81.91.165.0/24
• 81.91.166.0/23
• 81.91.168.0/21
• 2a02:568:1::/48
• 2a02:568:2::/47
• 2a02:568:4::/46
• 2a02:568:8::/45
• 2a02:568:10::/44
• 2a02:568:20::/43
• 2a02:568:40::/42
• 2a02:568:80::/41
• 2a02:568:100::/40
• 2a02:568:200::/39
• 2a02:568:400::/38
• 2a02:568:800::/37
• 2a02:568:1000::/36
• 2a02:568:2000::/35
• 2a02:568:4000::/34
• 2a02:568:8000::/33
• 2a02:568:fe01::/48
• 2a02:568:fe03::/48
• 2a02:568:fe04::/46
• 2a02:568:fe08::/45
• 2a02:568:fe10::/44
• 2a02:568:fe20::/43
• 2a02:568:fe40::/42
• 2a02:568:fe80::/41
• 2a02:568:ff00::/40

Upstream networks

• AS13237 euNetworks GmbH
• AS5539 SpaceNet AG
• AS24785 Broadband Hosting B.V.
• AS20562 Broadband Hosting B.V.
• AS6939 Hurricane Electric LLC
• AS34549 meerfarbig GmbH & Co. KG
• AS48362 Stadtwerke Feldkirch
• AS212024 Marc Schmitt
• AS37721 Virtual Technologies & Solutions
• AS24482 SG.GS
• AS3303 Swisscom (Schweiz) AG
• AS29632 Netassist International EOOD
• AS57463 NetIX Communications JSC
• AS20485 Joint Stock Company TransTeleCom
• AS37100 SEACOM Limited
• AS48185 team.blue NV
• AS34019 Hivane Association
• AS50673 Serverius Holding B.V.
• AS3333 Reseaux IP Europeens Network Coordination Centre (RIPE NCC)
• AS50300 CustodianDC Limited
• AS213241 TECHIT.BE SRL
• AS12552 GlobalConnect AB
• AS20766 Association "Gitoyen"
• AS56655 Gigahost AS
• AS17639 Converge ICT Solutions Inc.

Downstream networks

• AS12136 Nucleo de Inf. e Coord. do Ponto BR - NIC.BR
• AS31529 DENIC eG
• AS23600 Korea Internet Security Agency
• AS42385 Join-stock company "Internet Exchange"MSK-IX"
• AS35052 ACONET

Adjacent networks

• AS5539 SpaceNet AG
• AS31529 DENIC eG
• AS12136 Nucleo de Inf. e Coord. do Ponto BR - NIC.BR
• AS13237 euNetworks GmbH
• AS24785 Broadband Hosting B.V.
• AS23600 Korea Internet Security Agency
• AS6939 Hurricane Electric LLC
• AS42385 Join-stock company "Internet Exchange"MSK-IX"
• AS20562 Broadband Hosting B.V.
• AS34549 meerfarbig GmbH & Co. KG
• AS24482 SG.GS
• AS34019 Hivane Association
• AS17639 Converge ICT Solutions Inc.
• AS212024 Marc Schmitt
• AS29632 Netassist International EOOD
• AS35052 ACONET
• AS3303 Swisscom (Schweiz) AG
• AS37721 Virtual Technologies & Solutions
• AS48362 Stadtwerke Feldkirch
• AS20485 Joint Stock Company TransTeleCom
• AS213241 TECHIT.BE SRL
• AS57463 NetIX Communications JSC
• AS37100 SEACOM Limited
• AS12552 GlobalConnect AB
• AS1103 SURF B.V.

Internet exchanges

• DE-CIX Frankfurt — Frankfurt, Germany
• AMS-IX Amsterdam — Amsterdam, Netherlands