asn.dev

Autonomous system

AS56737 STADTWERKE-FLENSBURG-AS

Unclassified APNIC

IPv4 addresses 3.07K 2 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly DE
Exchanges 0 recorded by PCH
Upstreams 4 2 downstream
Flagged prefixes 0 none

Summary

Stadtwerke Flensburg

Germany · AI-generated

utility municipal business germany

STADTWERKE-FLENSBURG-AS is operated by Stadtwerke Flensburg GmbH.

What it's used for

  • The address space carries corporate infrastructure for a municipal utility, as indicated by the registrant Stadtwerke Flensburg GmbH and netnames DE-STWFL-20110503 and DE-STWFL-20160229.
  • The AS announces 3072 IPv4 addresses across 2 prefixes and 1 IPv6 prefix, with 4 observed neighbours, indicating a small-scale internal corporate network rather than a transit or large access provider.
  • Traffic from this AS consists of office workers, web/API endpoints, and internal systems for a utility company supplying electricity and other services to households and businesses in Flensburg and surrounding areas.

Notable

  • Registrants for both announced IPv4 prefixes agree with the announcer, listing Stadtwerke Flensburg GmbH as the holder.
  • The address inventory is compact, consisting of two IPv4 blocks and one IPv6 block, consistent with a single-site or limited multi-site corporate estate.

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

4 upstream, 2 downstream and 10 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS50629LWLcom GmbH70
AS6797GlobalConnect AB41
AS88811&1 Versatel GmbH36
AS31027GlobalConnect A/S5

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-18, 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

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS56737
Registry name
STADTWERKE-FLENSBURG-AS
Registrant
mnt-stwfl
Abuse contact
ripe-admin@stadtwerke-flensburg.de
Registered
2011-05-06
Last changed
2026-09-17
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 3 valid, 0 with no ROA
ROAs
3 authorising AS56737
ASPA
no ASPA record
IRR
100% registered · 3 of 3 announcements
Route objects
3 naming AS56737

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: 443 networks and 1,784 prefixes, as published 2026-10-19. 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