Autonomous system
AS15606 NASK-DNS-ANYCAST
Unclassified RIPE
Summary
NASK DNS anycast
infrastructure research government measurement
One /24 and one hundred and nineteen neighbours: this is a network announced from many places at once.
What it's used for
- Anycast name service for a national academic network operator. One IPv4
/24and one IPv6/48announced from Poland, two hundred and fifty-six addresses, across one hundred and nineteen observed BGP neighbours.
Notable
- The AS handle, the netname and the holder record all say the same thing: this number exists to carry name service, and the word anycast is written into each of them.
- One hundred and nineteen neighbours behind two hundred and fifty-six addresses is the highest ratio of connections to addresses in this part of the number range.
- The holder is a national research institute, named in full in capitals with no abbreviation.
- The registrant list is that institute and its registry role, with no third party involved.
- Three addresses were queried for reverse DNS and none returned a name.
Interesting
- Anycast works by announcing the same small block from many separate locations, so queries land at whichever copy is nearest. The neighbour count is the footprint: each connection is another place the service answers from.
- A dedicated AS number for one function is good practice for name service. It keeps the announcement independent of the rest of the organisation's routing and makes it obvious when it disappears.
- Two hundred and fifty-six addresses is more than enough. A resolver service needs a handful of addresses and a great many places to put them.
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 3 exchanges in 3 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| DE-CIX Frankfurt | Frankfurt, Germany | 80.81.192.188 |
| LINX LON1 | London, United Kingdom | 195.66.225.168 |
| TPIX - Internet Exchange | Warsaw, Poland | 195.149.233.240 |
Transit providers
20 upstream, 0 downstream and 29 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 2026-10-19, 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 · 256 addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| PL | Poland | 2 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS15606- Registry name
- NASK-DNS-ANYCAST
- Registrant
- NASK-ENUM-MNT
- Abuse contact
- abuse@nask.pl
- Registered
- 1970-01-01
- Last changed
- 2019-11-25
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 2 valid, 0 with no ROA
- ROAs
- 2 authorising AS15606
- ASPA
- no ASPA record
- IRR
- 100% registered · 2 of 2 announcements
- Route objects
- 3 naming AS15606
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 1,783 prefixes, as published 2026-10-20. 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