Autonomous system
AS21339 CONTINGENCYNETWORKS
Unclassified RIPE
Summary
Contingency Networks
isp regional broadband microwave
The AS handle CONTINGENCYNETWORKS is held by Contingency Networks Ltd.
What it's used for
- The address space carries broadband and connectivity services, evidenced by netnames such as
UK-CIRRUS1-20190820andUK-CNL-20140623, and reverse DNS entries pointing tostatic.e-know.net. - With 3328 IPv4 addresses announced across 6 prefixes and 28 observed neighbours, the ratio suggests a regional access provider rather than a large transit backbone.
Notable
- Registrants are largely consistent with the announcer, with five of six prefixes registered to Contingency Networks Ltd; the largest block, 45.143.120.0/22, is registered to Cirrus Blue Ltd.
- The address inventory is a mix of /22, /23, and /24 blocks, all located in the United Kingdom, indicating a focused regional footprint.
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 2 exchanges in 2 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| London Network Access Point | London, United Kingdom | 5.57.80.231 |
| Equinix Internet Exchange Paris | Paris, France | 195.42.145.70 |
Transit providers
8 upstream, 0 downstream and 8 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 2026-10-20, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 6 prefixes · 3.33K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| GB | United Kingdom | 6 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS21339- Registry name
- ContingencyNetworks
- Registrant
- cnl-maint
- Abuse contact
- jon@contingencynetworks.co.uk
- Registered
- 2012-09-06
- Last changed
- 2026-09-18
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 7 valid, 0 with no ROA
- ROAs
- 7 authorising AS21339
- ASPA
- no ASPA record
- IRR
- 100% registered · 7 of 7 announcements
- Route objects
- 8 naming AS21339
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 1,779 prefixes, as published 2026-10-21. 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