Autonomous system
AS12303 ISZT-AS 1132 Budapest Victor Hugo u. 18-22.
Unclassified RIPE
Summary
ISZT (Council of Hungarian Internet Service Providers)
ixp research legacy
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
/22of 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 asHU-ISZT-20120508to 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
.hudomains. 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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Budapest Internet Exchange | Budapest, Hungary | 193.188.137.8 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-15, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1 prefixes · 1.02K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| HU | Hungary | 2 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS12303- Registry name
- ISZT-AS
- Registrant
- AS5507-MNT
- Abuse contact
- abuse@nic.hu
- Registered
- 2005-06-14
- Last changed
- 2026-06-22
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 2 with no ROA
- ROAs
- 1 authorising AS12303
- ASPA
- no ASPA record
- IRR
- 100% registered · 2 of 2 announcements
- Route objects
- 5 naming AS12303
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 1,781 prefixes, as published 2026-10-16. 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