Autonomous system
AS13037 ZEN-AS Zen Internet - UK
Residential RIPE
Summary
Zen Internet
isp hosting business
An ISP whose forward hostnames contain the label in-addr, borrowed from the reverse tree.
What it's used for
- A British internet provider. 527,616 addresses across 36 IPv4 prefixes, one IPv6 prefix, and 94 observed BGP neighbours.
Notable
- Netnames are mostly
UK-ZEN, dated20010629,20020703,20030428and20100604, with two left bare. - One breaks the pattern entirely:
ZEN20110301-DAR-ZEN-ADSL13, date first, no country prefix, and a suffix naming a product and a numbered block. - Sixteen of eighteen sampled addresses returned names in two forms:
82-68-128-0.dsl.in-addr.zen.co.ukand51-148-64-0.dsl.zen.co.uk. - One address answers
mailgate.cj-dev.uk, a customer's own domain.
Interesting
in-addrinside a forward hostname is the record worth pausing on. That label belongs toin-addr.arpa, the tree reverse lookups are answered from; it has no meaning underzen.co.uk. Someone building the generated zone copied the shape of the reverse hierarchy into the forward name, and the newer blocks dropped it. Two generations of the same script are visible side by side.- A customer domain appearing in the middle of ISP-generated space means that address has a manually set name overriding the template. Business lines get named for what they run; consumer lines get named for their address.
- Six dated netnames spanning 2001 to 2011 track a provider that kept coming back for more space across a decade.
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
Recorded at 3 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| LINX LON1 | London, United Kingdom | 195.66.224.158 |
| London Network Access Point | London, United Kingdom | 5.57.80.48 |
| LINX Manchester | Manchester, United Kingdom | 195.66.244.28 |
Transit providers
16 upstream, 3 downstream and 28 adjacent networks observed; most-used upstreams first.
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
IPv4 36 prefixes · 528K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| GB | United Kingdom | 37 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS13037- Registry name
- ZEN-AS
- Registrant
- Zen Internet Ltd
- Abuse contact
- abuse@zen.co.uk
- Registered
- 2002-09-20
- Last changed
- 2023-08-02
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 82% valid · 31 valid, 7 with no ROA
- ROAs
- 33 authorising AS13037
- ASPA
- no ASPA record
- IRR
- 100% registered · 38 of 38 announcements
- Route objects
- 313 naming AS13037
Reputation
Classification and threat
Residential Fixed-line consumer ISP. Addresses here are homes.
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 1,773 prefixes, as published 2026-10-13. 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