Autonomous system
AS12611 RKOM R-KOM Regensburger Telekommunikationsgesellschaft mbH
Unclassified RIPE
Summary
R-KOM
isp business telecom
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-19990728through20001215,20011212,20020412,20051028,20090312,20110128,20111021,20120621,20120717and20150929. - Sampled addresses in the largest block answer
130-185-16-0.cgnat.rz1.r-kom.netand130-185-47-254.cgnat.rz3.r-kom.net. - Addresses in the other blocks answer
hsi.r-kom.netinstead, as in80-209-207-255.hsi.r-kom.net. - The IPv6 announcement is
2001:16e0::/29.
Interesting
cgnatis 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
rz1andrz3labels number the data centres the translation runs in, so the reverse zone doubles as a topology map. The/18carrying 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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 2 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| DE-CIX Frankfurt | Frankfurt, Germany | 80.81.192.202 |
| DE-CIX Munich | Munich, Germany | 185.1.208.72 |
Transit providers
17 upstream, 9 downstream and 47 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-15, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 16 prefixes · 57.86K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| DE | Germany | 17 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS12611- Registry name
- RKOM
- Registrant
- R-KOM Regensburger Telekommunikationsgesellschaft mbH
- Abuse contact
- abuse@r-kom.de
- Registered
- 2002-09-25
- Last changed
- 2026-04-28
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 17 valid, 0 with no ROA
- ROAs
- 17 authorising AS12611
- ASPA
- no ASPA record
- IRR
- 100% registered · 17 of 17 announcements
- Route objects
- 17 naming AS12611
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,782 prefixes, as published 2026-10-16. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere