asn.dev

Autonomous system

AS31438 SWMR-AS Citynet Marburg

Unclassified RIPE

IPv4 addresses 3.07K 2 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly DE
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Stadtwerke Marburg

Germany · AI-generated

utility municipal residential business

SWMR-AS is operated by Stadtwerke Marburg GmbH.

What it's used for

  • The address space carries municipal utility services, with registrant netnames DE-SWMR-20040507 and DE-SWMR-19990518 both attributed to Stadtwerke Marburg GmbH.
  • The AS announces 3072 IPv4 addresses across 2 prefixes and 1 IPv6 prefix, while observing only 2 routing neighbours, a ratio consistent with a local access or service network rather than a transit provider.

Notable

  • Registrants for both announced IPv4 prefixes align with the AS holder, Stadtwerke Marburg GmbH.
  • The address inventory consists of two distinct IPv4 blocks, 83.137.64.0/21 and 212.89.196.0/22, alongside a single IPv6 prefix, 2a0d:5f00::/30.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

2 upstream, 0 downstream and 4 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS9145EWE TEL GmbH101
AS88811&1 Versatel GmbH48

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 2 prefixes · 3.07K addresses IPv6 1 prefixes

CountryNamePrefixes
DEGermany3

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS31438
Registry name
SWMR-AS
Registrant
Stadtwerke Marburg GmbH
Abuse contact
support@citynet-marburg.de
Registered
2004-05-18
Last changed
2026-01-22
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 3 valid, 0 with no ROA
ROAs
3 authorising AS31438
ASPA
no ASPA record
IRR
100% registered · 3 of 3 announcements
Route objects
4 naming AS31438

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 1,773 prefixes, as published 2026-10-13. 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

Cross-check