AS13091 — PTT-SRBIJA-NET

AS13091 announces 11 IPv4 prefixes covering 47,872 addresses and 0 IPv6 prefixes.

About this network

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.

Announced prefixes

• 82.208.192.0/19
• 82.208.224.0/20
• 82.208.240.0/22
• 82.208.248.0/21
• 89.110.192.0/18
• 212.62.32.0/20
• 212.62.48.0/21
• 212.62.56.0/23
• 212.62.58.0/24
• 212.62.60.0/22
• 213.137.96.0/19

Upstream networks

• AS8400 TELEKOM SRBIJA a.d.

Adjacent networks

• AS8400 TELEKOM SRBIJA a.d.