Autonomous system
AS1921 RCODEZERO-ANYCAST-SEC1-TLD RcodeZero Anycast DNS
Hosting RIPE
Summary
RcodeZero Anycast DNS (nic.at)
dns legacy
The RCODEZERO-ANYCAST network, a managed anycast DNS service operated by ipcom GmbH, a subsidiary of nic.at (the registry for Austria's .at top-level domain).
What it's used for
- Running a global anycast DNS platform used to serve authoritative name service for
.atand many other TLDs and domains.
Notable
- Infrastructure for authoritative DNS, not general web hosting or transit. The service is anycast across many worldwide nodes for resilience.
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 11 exchanges in 11 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| LINX LON1 | London, United Kingdom | 195.66.227.115 |
| NetIX | Sofia, Bulgaria | 2001:67c:29f0::5:7463:173 |
| SwissIX | Zurich, Switzerland | 91.206.52.164 |
| Luxembourg Internet Exchange | Luxembourg, Luxembourg | 188.93.170.127 |
| Belgian National Internet Exchange | Brussels, Belgium | 194.53.172.38 |
| Gigabit Portuguese Internet Exchange Point | Lisbon, Portugal | 193.136.250.214 |
| Rheintal Internet Exchange | Eschen, Liechtenstein | 91.232.229.25 |
| Slovenian Internet Exchange | Ljubljana, Slovenia | 91.220.194.18 |
Transit providers
38 upstream, 3 downstream and 65 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 10 prefixes · 2.56K addresses IPv6 11 prefixes
| Country | Name | Prefixes |
|---|---|---|
| AT | Austria | 21 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS1921- Registry name
- RCODEZERO-ANYCAST-SEC1-TLD
- Registrant
- NICAT-MNT
- Abuse contact
- reports@cert.at
- Registered
- 2002-08-21
- Last changed
- 2026-05-12
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 87% valid · 26 valid, 4 with no ROA
- ROAs
- 42 authorising AS1921
- ASPA
- no ASPA record
- IRR
- 100% registered · 30 of 30 announcements
- Route objects
- 82 naming AS1921
Reputation
Classification and threat
Hosting Datacenter or cloud provider. Addresses are servers, not people.
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: 431 networks and 1,768 prefixes, as published 2026-10-12. 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