AS12303 — ISZT-AS 1132 Budapest Victor Hugo u. 18-22.

AS12303 announces 1 IPv4 prefixes covering 1,024 addresses and 1 IPv6 prefixes.

About this network

The network of ISZT, the Hungarian internet providers' association, which runs the country's main exchange point and its domain registry.

What it's used for

• Shared national infrastructure. One /22 of 1,024 addresses and one IPv6 /40, with nine observed BGP neighbours.

Notable

• A thousand addresses and nine neighbours. The ratio is the point: this is not a network that carries traffic for anyone, it is a network that other networks connect to.
• The single IPv4 block, 5.28.0.0/22, is registered as HU-ISZT-20120508 to the association's nonprofit operating company.
• The registry's AS handle field holds a street address in Budapest, Victor Hugo utca 18-22, rather than a description.

Interesting

• ISZT is an unusual thing for a network to belong to. It is a trade association of the country's providers, and between them they decided it should run the exchange where they all meet and the registry that hands out .hu domains. Both jobs need a neutral operator, and a body owned collectively by the competitors is one answer to that.
• The address in the AS handle is not incidental. Victor Hugo utca is where the exchange itself lives, and for a network whose whole purpose is being the place everyone else plugs into, the building is more informative than any description would be.

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

Announced prefixes

• 5.28.0.0/22
• 2a00:e6a0::/40

Upstream networks

• AS62214 Rackforest Zrt.
• AS6939 Hurricane Electric LLC
• AS8447 A1 Telekom Austria AG
• AS33891 Core-Backbone GmbH

Adjacent networks

• AS62214 Rackforest Zrt.
• AS6939 Hurricane Electric LLC
• AS33891 Core-Backbone GmbH
• AS8447 A1 Telekom Austria AG

Internet exchanges

• Budapest Internet Exchange — Budapest, Hungary