Autonomous system
AS51191 XIRRA
Unclassified RIPE
Summary
Xirra
hosting colocation business
XIRRA is operated by Core-Backbone GmbH.
What it's used for
- The address space carries server and colocation infrastructure, evidenced by reverse DNS entries such as
shcl-8155e.serverlet.comandmx120a.serverlet.com. - The AS announces 7168 IPv4 addresses and 140 IPv6 prefixes across 9 IPv4 prefixes, with only 4 observed neighbours, indicating a hosting or colocation provider rather than a transit carrier.
- Traffic from this AS consists of web/API endpoints and server workloads for clients utilizing Xirra's colocation and server hosting services.
Notable
- Registrants for the majority of prefixes are listed as
Core-Backbone GmbH, aligning with the AS holder, while one prefix (185.169.24.0/23) is registered toShellrent S.r.l.. - The address inventory is finely subdivided, with multiple small /23 and /24 blocks alongside larger /21 and /22 allocations, consistent with an internal corporate estate or segmented client hosting environment.
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
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 9 prefixes · 7.17K addresses IPv6 140 prefixes
| Country | Name | Prefixes |
|---|---|---|
| DE | Germany | 149 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS51191- Registry name
- XIRRA
- Registrant
- CORE-BACKBONE
- Abuse contact
- abuse@core-backbone.com
- Registered
- 2011-02-07
- Last changed
- 2025-06-25
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 99.2% valid · 256 valid, 2 with no ROA
- ROAs
- 14 authorising AS51191
- ASPA
- 4 declared providers
- IRR
- 100% registered · 258 of 258 announcements
- Route objects
- 786 naming AS51191
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 1,783 prefixes, as published 2026-10-17. 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