asn.dev

Autonomous system

AS24605 FASSBERG

Unclassified RIPE

IPv4 addresses 256 1 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly SE
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Fassberg Holding AB

Sweden · AI-generated

business sweden small

The AS handle FASSBERG is held by Fassberg Holding AB.

What it's used for

  • The space carries a single IPv4 block with netname SE-FASSBERG and registrant Leissner Data AB.
  • The inventory consists of 256 IPv4 addresses and 1 IPv6 prefix, with 1 observed neighbour, indicating a small, isolated corporate or business network.

Notable

  • The RDAP registrant for the announced prefix is Leissner Data AB, which differs from the AS holder Fassberg Holding AB.
  • The address inventory is minimal, comprising one /24 IPv4 prefix and one /48 IPv6 prefix.

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

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

ASNetworkPaths seen
AS12597Gotalandsnatet AB95

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 1 prefixes · 256 addresses IPv6 1 prefixes

CountryNamePrefixes
SESweden2

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS24605
Registry name
FASSBERG
Registrant
LEISSNER-MNT
Abuse contact
abuse@leissner.se
Registered
2002-01-17
Last changed
2017-11-15
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 2 with no ROA
ROAs
0 authorising AS24605
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
2 naming AS24605

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 1,772 prefixes, as published 2026-10-15. 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