Autonomous system
AS51545 ZSAH
Unclassified RIPE
Summary
zsah Limited
business managed-services cloud
The AS handle ZSAH is held by zsah Limited.
What it's used for
- The address space carries managed technology services infrastructure, evidenced by the reverse DNS record
smtprelay.southlanarkshire.gov.ukand netnamesUK-ZSAHLIMITED-20160608andZSAH-NET. - The AS announces 1024 IPv4 addresses across 3 prefixes with 3 observed neighbours, indicating a small-scale business network rather than a transit or large access provider.
- Traffic from this AS consists of web and API endpoints, cloud services, and managed IT operations for private business and public sector clients.
Notable
- All registrants for the announced prefixes are
zsah Limited, matching the AS holder. - zsah Limited provides high-performance managed cloud, DevOps, and digital services for the private and public sectors.
- The inventory consists of three distinct IPv4 prefixes with no IPv6 announcements.
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 2026-10-18, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 3 prefixes · 1.02K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| GB | United Kingdom | 3 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS51545- Registry name
- ZSAH
- Registrant
- zsah Limited
- Abuse contact
- abuse@zsah.net
- Registered
- 2010-09-23
- Last changed
- 2021-10-25
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 4 valid, 0 with no ROA
- ROAs
- 4 authorising AS51545
- ASPA
- no ASPA record
- IRR
- 50% registered · 2 of 4 announcements
- Route objects
- 3 naming AS51545
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