asn.dev

Autonomous system

AS13091 PTT-SRBIJA-NET

Unclassified RIPE

IPv4 addresses 47.87K 11 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly RS
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Posta Srbije

Serbia · AI-generated

isp telecom government

A national postal service running an ISP, with the access product written into every hostname.

What it's used for

  • The network of Serbia's postal operator. 47,872 addresses across 11 IPv4 prefixes, one observed BGP neighbour, and no IPv6 announced.

Notable

  • Netnames are all RS-PTTSRBIJA, dated 990301, 20020610, 20030926 and 20060418.
  • Five of 18 sampled addresses returned names: pttcable89-110-239-254.ptt.rs, pttadsl82-208-215-254.ptt.rs, bgas4-254.ptt.rs and kds13-254.ptt.rs.
  • Every address that answered ends in .254.
  • One observed BGP neighbour for 47,872 addresses.

Interesting

  • Only the .254 addresses have names. That is the last usable address in each block, conventionally the router, so the zone was populated for gateways and left empty for everything behind them. The sample happens to test exactly those addresses, which is why the pattern is so stark.
  • Two hostname prefixes name two different access technologies from two different eras, both still in service under one domain. A subscriber's connection type is legible from their address without asking anyone.
  • A postal service is an odd shape for an internet provider until you notice what it already had: buildings in every town, cables between them, and a licence. Several European postal operators became telecoms this way, and the address space records the date each expansion needed more room.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS8400TELEKOM SRBIJA a.d.732

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 11 prefixes · 47.87K addresses IPv6 0 prefixes

CountryNamePrefixes
RSSerbia11

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS13091
Registry name
PTT-SRBIJA-NET
Registrant
Posta Srbije Drustvo S Ogranicenom Odgovornoscu, Beograd
Abuse contact
netabuse@ptt.rs
Registered
2002-08-21
Last changed
2023-10-27
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 12 with no ROA
ROAs
0 authorising AS13091
ASPA
no ASPA record
IRR
100% registered · 12 of 12 announcements
Route objects
36 naming AS13091

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: 436 networks and 1,771 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

Cross-check