AS12660 — SHARIF-EDU-NET

AS12660 announces 4 IPv4 prefixes covering 18,432 addresses and 0 IPv6 prefixes.

About this network

Six announcements sharing one netname and one allocation date, tiling a single /19 exactly.

What it's used for

• Academic and regional connectivity in Tehran. 18,432 addresses in nine IPv4 prefixes, two observed BGP neighbours, and no IPv6 announced.

Notable

• Six blocks all carry the netname IR-SHARIF-20020603: 81.31.160.0/20, 81.31.176.0/21, 81.31.184.0/23, 81.31.186.0/24, 81.31.187.0/24 and 81.31.188.0/22.
• Together those six cover 81.31.160.0/19 exactly.
• The remaining blocks are IR-SHARIF-20030404, IR-SHARIF-20190123, and one registered under the name Dadehaye-Donyaye-Door.
• Eighteen sampled addresses were queried and none returned a name.

Interesting

• Deaggregation usually has an innocent explanation: separate allocations, arriving at different times, announced as they were received. These six rule that out. One netname, one date, one contiguous /19 — and six routes where one would do. Whatever split this range happened after the addresses arrived, inside the network, for reasons the registry never recorded.
• Every router on the Internet carries all six. A single /19 announcement would be indistinguishable to anyone sending traffic here, which is what makes patterns like this the main driver of routing-table growth.
• A university holding eighteen thousand addresses and announcing them for others is the normal shape of early national Internet infrastructure: the first organisation in a country to have a connection ends up carrying everyone who comes next.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 2.189.80.0/22
• 81.31.160.0/19
• 152.89.12.0/22
• 213.233.160.0/19

Upstream networks

• AS42337 Respina Networks & Beyond PJSC
• AS6736 Institute for Research in Fundamental Sciences

Adjacent networks

• AS42337 Respina Networks & Beyond PJSC
• AS6736 Institute for Research in Fundamental Sciences

Routing security

• RPKI: 7 valid, 0 invalid and 25 not-found announcements; 9 ROAs.
• ASPA: none published.
• IRR: 13% of announcements registered; 21 route objects.
• Listed in as-sets: AS-DCI, AS-IR-ASN, AS-IRANET-IPM, AS-IRANET-IPM-V6, AS-RESPINA, AS-RETN-ACTUAL-V4, AS-SEABONECUSTAS, AS-SMS, AS-TICGW, AS-TRANSROUTE-SPEC, AS3491:AS-CUSTOMERS-EU, AS34984:AS-TELLCOM, AS41194:AS-RASCOM.