Autonomous system
AS50300 CUSTDC
Unclassified ARIN
Summary
CustodianDC
hosting datacenter nsp uk
CUSTDC is operated by CustodianDC Limited.
What it's used for
- The address space carries datacenter and hosting infrastructure, evidenced by netnames such as
UK-CUSTDC-20120628andUK-CUSTDC-20091113registered to Custodian NOC. - The AS announces 10,752 IPv4 addresses across 17 prefixes and 7 IPv6 prefixes, while maintaining 1,156 observed neighbours; this high neighbour-to-address ratio indicates a transit or network service provider role rather than an access network.
- Traffic from this AS consists of datacenter tenants, web endpoints, and API services hosted within CustodianDC's facilities, consistent with its business model as a UK-based datacenter operator.
Notable
- Registrants for the majority of prefixes are Custodian NOC and CustodianDC Limited, which aligns with the AS holder; however,
185.14.164.0/22is registered to Clear Picture Services Limited and92.118.16.0/24to Swiftping Limited, indicating leased or third-party space within the AS. - The inventory is composed of multiple /22 and /23 blocks from various RIR allocations, including 5.102.168.0/21, 109.74.240.0/22, and 176.12.104.0/22, reflecting a consolidated but diverse address 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
Internet exchanges
Recorded at 3 exchanges in 2 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| LINX LON1 | London, United Kingdom | 195.66.224.139 |
| AMS-IX Amsterdam | Amsterdam, Netherlands | 80.249.211.14 |
| London Network Access Point | London, United Kingdom | 5.57.80.96 |
Transit providers
28 upstream, 1,124 downstream and 1,098 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 2026-10-10, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 17 prefixes · 10.75K addresses IPv6 7 prefixes
| Country | Name | Prefixes |
|---|---|---|
| GB | United Kingdom | 24 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS50300- Registry name
- CUSTDC
- Registrant
- MNT-CUSTODIAN
- Abuse contact
- abuse@CustodianDC.com
- Registered
- 2009-12-16
- Last changed
- 2026-03-20
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 96% valid · 44 valid, 2 with no ROA
- ROAs
- 9 authorising AS50300
- ASPA
- no ASPA record
- IRR
- 100% registered · 46 of 46 announcements
- Route objects
- 88 naming AS50300
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: 431 networks and 1,775 prefixes, as published 2026-10-11. 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