AS12611 — RKOM R-KOM Regensburger Telekommunikationsgesellschaft mbH

AS12611 announces 16 IPv4 prefixes covering 57,856 addresses and 1 IPv6 prefixes.

About this network

A Regensburg city network whose reverse names say which customers are behind carrier NAT and which data centre they sit in.

What it's used for

• Internet access in and around Regensburg. 57,856 addresses in 16 IPv4 prefixes, one IPv6 prefix, and 122 observed BGP neighbours.

Notable

• Twelve netname dates from DE-R-KOM-19990728 through 20001215, 20011212, 20020412, 20051028, 20090312, 20110128, 20111021, 20120621, 20120717 and 20150929.
• Sampled addresses in the largest block answer 130-185-16-0.cgnat.rz1.r-kom.net and 130-185-47-254.cgnat.rz3.r-kom.net.
• Addresses in the other blocks answer hsi.r-kom.net instead, as in 80-209-207-255.hsi.r-kom.net.
• The IPv6 announcement is 2001:16e0::/29.

Interesting

• cgnat is carrier-grade address translation: many subscribers sharing one public address. Publishing that label in reverse DNS tells anyone who looks which addresses cannot be traced to a single customer, which is useful to an abuse desk reading logs and equally useful to anyone deciding whether blocking an address will hit one household or a hundred.
• The rz1 and rz3 labels number the data centres the translation runs in, so the reverse zone doubles as a topology map. The /18 carrying the shared addresses is the largest block here — the growth of the subscriber base outran the address supply, and this is what the workaround looks like from outside.
• Twelve dated allocations across sixteen years is the most complete growth record in this stretch of the number range, one row per visit to the registry.

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

Announced prefixes

• 5.149.224.0/20
• 46.227.96.0/21
• 80.209.192.0/19
• 81.27.160.0/20
• 88.133.176.0/20
• 88.133.232.0/21
• 91.106.120.0/21
• 95.130.160.0/21
• 130.185.0.0/18
• 185.119.92.0/22
• 193.23.119.0/24
• 194.55.106.0/23
• 194.150.226.0/23
• 194.169.251.0/24
• 212.77.160.0/19
• 217.74.0.0/21
• 2001:16e0::/29

Upstream networks

• AS1299 Arelion Sweden AB
• AS60169 R-KOM Regensburger Telekommunikationsgesellschaft mbH
• AS2914 NTT America, Inc.
• AS6939 Hurricane Electric LLC
• AS34549 meerfarbig GmbH & Co. KG
• AS24482 SG.GS
• AS48362 Stadtwerke Feldkirch
• AS212024 Marc Schmitt
• AS34019 Hivane Association
• AS20485 Joint Stock Company TransTeleCom
• AS37100 SEACOM Limited
• AS3303 Swisscom (Schweiz) AG
• AS57463 NetIX Communications JSC
• AS37721 Virtual Technologies & Solutions
• AS29632 Netassist International EOOD
• AS213241 TECHIT.BE SRL

Downstream networks

• AS20902 DegNet GmbH
• AS204796 Krones AG
• AS41307 Telepark Passau GmbH
• AS209537 Vying Technologies OU
• AS13012 Stefan Englhardt
• AS205033 Stadt Regensburg
• AS25504 Vautron Rechenzentrum AG
• AS200224 DWE GmbH
• AS214014 Stadt Straubing

Adjacent networks

• AS20902 DegNet GmbH
• AS6939 Hurricane Electric LLC
• AS1299 Arelion Sweden AB
• AS2914 NTT America, Inc.
• AS60169 R-KOM Regensburger Telekommunikationsgesellschaft mbH
• AS41307 Telepark Passau GmbH
• AS204796 Krones AG
• AS34549 meerfarbig GmbH & Co. KG
• AS13012 Stefan Englhardt
• AS209537 Vying Technologies OU
• AS25504 Vautron Rechenzentrum AG
• AS205033 Stadt Regensburg
• AS200224 DWE GmbH
• AS214014 Stadt Straubing
• AS24482 SG.GS
• AS212024 Marc Schmitt
• AS57463 NetIX Communications JSC
• AS48362 Stadtwerke Feldkirch
• AS37100 SEACOM Limited
• AS20485 Joint Stock Company TransTeleCom
• AS3303 Swisscom (Schweiz) AG
• AS17639 Converge ICT Solutions Inc.
• AS34019 Hivane Association
• AS37721 Virtual Technologies & Solutions
• AS29632 Netassist International EOOD

Internet exchanges

• DE-CIX Frankfurt — Frankfurt, Germany
• DE-CIX Munich — Munich, Germany