asn.dev

Autonomous system

AS29156 AS29156 - DXC Technology Danmark A/S

Unclassified RIPE

IPv4 addresses 66.05K 8 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly DK
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

DXC Technology Danmark A/S

Denmark · AI-generated

business it-services corporate

AS29156 is operated by DXC Technology Danmark A/S.

What it's used for

  • The address space carries corporate IT infrastructure, evidenced by netnames DXC-1 through DXC-8 and registrant DXCDKSEC-RIPE.
  • One prefix, 45.149.136.0/22, is registered to Okonomistyrelsen with netname DK-STATENS-LOEN-LOESNING-20190904, indicating a government payroll solution hosted within this AS.
  • The AS announces 66,048 IPv4 addresses across 8 prefixes and 1 IPv6 prefix, with only 1 observed neighbour, implying a single-site or internal corporate estate rather than a transit or access network.

Notable

  • Registrants for the majority of prefixes (DXC-1 to DXC-8) align with the announcer, while the 45.149.136.0/22 block is registered to a Danish government agency, suggesting a managed service or leased space arrangement.
  • DXC Technology is a global IT services provider formed from the merger of HP Enterprise Services and CSC in 2017; this AS represents its Danish subsidiary.
  • The inventory consists of a large contiguous block in 147.29.0.0/17 and smaller subdivisions, alongside a single /22 in a different range, reflecting a finely subdivided internal 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

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

ASNetworkPaths seen
AS3292TDC Holding A/S505

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, 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 8 prefixes · 66.05K addresses IPv6 1 prefixes

CountryNamePrefixes
DKDenmark9

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS29156
Registry name
AS29156
Registrant
DXCDK-SECURITY-MNT
Abuse contact
SCA-Hostmaster@dxc.com
Registered
2003-06-17
Last changed
2021-08-23
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
89% valid · 8 valid, 1 with no ROA
ROAs
9 authorising AS29156
ASPA
no ASPA record
IRR
100% registered · 9 of 9 announcements
Route objects
10 naming AS29156

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: 432 networks and 1,768 prefixes, as published 2026-10-12. 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