Autonomous system
AS15572 CYBERTRUST former Cybertrust
Unclassified RIPE
Summary
Verizon UK
transit telecom business enterprise
Three registrant fields hold internal account numbers, prefixed with the word internal.
What it's used for
- A carrier's national arm. Fourteen IPv4 prefixes and one IPv6
/48announced from the United Kingdom, four thousand addresses, through two observed BGP neighbours.
Notable
- Three blocks list a registrant made of the word internal, a slash, a retired carrier's initials and a long digit string, which reads as an account or ticket reference rather than an owner.
- One block names a law firm followed by a slash, an abbreviation for international, a circuit type and a number, so a customer and the service they bought are both in the registry.
- One netname carries octets that do not match the block it belongs to.
- Blocks are registered to four different national entities of the same group, in four different countries.
- Two blocks' registry lookups failed, so their details are unknown rather than absent.
- Eighteen addresses were queried for reverse DNS and none returned a name.
Interesting
- Internal reference numbers in a public field are a small leak with a long life. They say nothing on their own and everything to anyone who can read that numbering scheme.
- Twelve of the fourteen blocks are
/24prefixes scattered across unrelated ranges, which is the shape of address space accumulated through acquisitions rather than allocated. - The AS handle states outright that the brand it carries is a former one, which is more honesty than these fields usually contain.
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 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 14 prefixes · 4.10K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| GB | United Kingdom | 15 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS15572- Registry name
- Cybertrust
- Registrant
- AS1849-MNT
- Abuse contact
- abuse.emea@verizon.com
- Registered
- 2013-09-16
- Last changed
- 2017-11-15
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 16 with no ROA
- ROAs
- 0 authorising AS15572
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 16 announcements
- Route objects
- 0 naming AS15572
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 1,773 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