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Network report

Who holds an IP address, prefix or AS number, how it is routed (origin AS, RPKI, IRR), its reverse DNS, blocklist listings and PeeringDB record, with what to fix first.

IP address, prefix or AS number

AS12303 · 

curl -s "https://thenetworkery.com/api/v1/network-report?query=AS12303"
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Warning: AS12303 (ISZT-AS) announces 1 IPv4 and 1 IPv6 prefixes. 2 warnings

AS pageAS12303
HolderISZT-AS Magyarorszagi Internet Szolgaltatok Tanacsa Tudomanyos Egyesulet
AllocationRIPE NCC, Hungary (HU), allocated 2005-06-14
Prefixes (IPv4 / IPv6)1 / 1
RPKI valid0% (0 / 2)
Upstreams and peers7
Peering policyOpen

What to fix

  1. Warning

    2 of 2 announced prefixes have no ROA (RPKI not found): 5.28.0.0/22, 2a00:e6a0::/40.

    Without a ROA, networks cannot tell your routes from a hijack.

    Fix: Create a ROA for each at your RIR portal, with origin AS12303 and a max length equal to the prefix length:

    5.28.0.0/22 AS12303 max-length /22
2a00:e6a0::/40 AS12303 max-length /40

    Open in RPKI / ROA validator Guide

  2. Warning

    No public NOC, policy or technical contact.

    Other networks use these addresses to set up peering and to reach you during an incident.

    Fix: Add a role contact (for example noc@ or peering@ an address you monitor) with visibility Public.

    Open in PeeringDB lookup

Checks

Routing and RPKI 2 of 2 announced prefixes have no ROA (RPKI not found): 5.28.0.0/22, 2a00:e6a0::/40.
  • Pass: AS12303 announces 1 IPv4 and 1 IPv6 prefixes.
  • Warning: 2 of 2 announced prefixes have no ROA (RPKI not found): 5.28.0.0/22, 2a00:e6a0::/40.
  • Pass: Every announced prefix has an IRR route object.
  • Info: 7 upstreams and peers, 0 downstream networks seen.
HolderISZT-AS Magyarorszagi Internet Szolgaltatok Tanacsa Tudomanyos Egyesulet
IPv4 prefixes1
IPv6 prefixes1
RPKI2 not found
Downstream networks0
Routes to fix
PrefixRPKI
5.28.0.0/22 No ROA
2a00:e6a0::/40 No ROA

Upstreams and peers seen to the left 7

AS62214 RackForest AS6939 Hurricane Electric AS33891 Core-Backbone AS47692 Nessus GmbH AS15958 CETIN Ltd. Belgrade AS21215 UGNI AS6663 Türk Telekom International

Announced prefixes 2

5.28.0.0/22 2a00:e6a0::/40

Source: RIPEstat (RIPE NCC RIS, Routinator, IRR); AS names: Team Cymru

Open in ASN & BGP prefix lookup
Registration Found at rdap.db.ripe.net.
  • Pass: Found at rdap.db.ripe.net.
NameISZT-AS
HandleAS12303
RangeAS12303
Statusactive
Registered2005-06-14T09:03:41Z
Last changed2026-06-22T11:18:49Z
Abuse contactabuse@nic.hu
Allocation
Registry (RIR)RIPE NCC
CountryHungary (HU)
Delegated on2005-06-14
StatusAllocated
Delegated rangeAS12303

Source: RIR delegation data, updated daily. The country is where the range was registered, not necessarily where it is used.

Contacts
RoleNameEmail
registrant AS5507-MNT
registrant HU-NIC-MNT
registrant Magyarorszagi Internet Szolgaltatok Tanacsa Tudomanyos Egyesulet
registrant RIPE-NCC-END-MNT
abuse Abuse-C Role abuse@nic.hu

Source: https://rdap.db.ripe.net/autnum/12303. Registration data from rdap.db.ripe.net, shown under its terms of use (terms): not for marketing or bulk collection. Personal contacts in this registry are not shown.

Open in WHOIS / RDAP lookup
PeeringDB No public NOC, policy or technical contact.
  • Pass: AS12303 is in PeeringDB as .hu Domain Registry.
  • Info: Peering policy: Open.
  • Info: Present at 1 internet exchanges with 2 ports (20G in total).
  • Warning: No public NOC, policy or technical contact.
Network.hu Domain Registry (ISZT Nonprofit Kft)
AS numberAS12303
TypeNon-Profit, Not Disclosed
Websitehttps://www.domain.hu/
IRR as-setRIPE::AS-ISZT
Prefixes (IPv4 / IPv6)10 / 10
TrafficNot Disclosed
Peering policyOpen
LocationsNot Required
Ratio requiredNo
ContractsNot Required
Last updated2026-05-27

Source: PeeringDB. Results are cached for an hour.

Open in PeeringDB lookup