Autonomous system
AS15261 ZT
Unclassified ARIN
Summary
Zellius Telecommunications
isp telecom business
A two-letter AS handle, the shortest in this range.
What it's used for
- A telecommunications company's network. Two IPv4 prefixes announced from Puerto Rico, no IPv6, and two observed BGP neighbours.
Notable
- The AS handle is two letters, the company's initials and nothing else, where most handles in this range run to eight or more characters.
- Both blocks carry the same netname, the company's first word alone, and the same registrant.
- The two prefixes come from one range but are not adjacent: a
/24sits two blocks below a/23, with the block between them announced by nobody. - Six addresses were queried for reverse DNS and none returned a name.
- The routing history begins in 2000.
Interesting
- A two-letter handle is a claim staked early. Short identifiers were available when this number was issued and are not now, and the fact that it survives means nobody has had to disambiguate it since.
- Announcing from Puerto Rico puts this network in a territory whose connectivity depends on submarine cable landings, where two upstreams means something different than it does on a continent.
- One netname, one registrant, no reverse names, and seven hundred and sixty-eight addresses. The record is consistent and says almost nothing, which describes most small carriers here.
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 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 768 addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| PR | Puerto Rico | 2 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS15261- Registry name
- ZT
- Registrant
- Zellius Telecommunications Inc.
- Abuse contact
- lenny.santiago@zellius.net
- Registered
- 2010-10-12
- Last changed
- 2012-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 3 valid, 0 with no ROA
- ROAs
- 4 authorising AS15261
- ASPA
- no ASPA record
- IRR
- 100% registered · 3 of 3 announcements
- Route objects
- 5 naming AS15261
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 1,783 prefixes, as published 2026-10-17. 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