Autonomous system
AS5601 Kungliga Tekniska Hogskolan
Education RIPE
Summary
KTH Royal Institute of Technology
education university research legacy
AS5601 is registered to Kungliga Tekniska Högskolan — the KTH Royal Institute of Technology in Stockholm, Sweden's largest technical university. The RIPE object carries a single telling remark: Center for Parallel Computers, KTH's PDC high-performance computing centre.
What it's used for
University and research computing. The address space serves KTH's academic infrastructure — with the PDC connection, that means supercomputing and HPC-adjacent systems alongside ordinary campus networking. Roughly 1,500 addresses: institutional scale, not provider scale.
Notable
Institutional address space behaves nothing like consumer or hosting ranges. Hosts here are lab machines, compute clusters, servers and staff/student systems on a campus network, and the AS sits within the Swedish academic networking ecosystem rather than buying commodity transit.
Interesting
The low number reflects how early European universities showed up on the internet — technical universities were among the first organisations in any country to need routing of their own. KTH's number lands in the same RIPE block as commercial ISPs registered years later, so the age of the block is not the age of every holder in it, but for a national technical university the early-adopter reading is a fair one.
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
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS2839 | Tekniska Hogskolan | 183 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-02, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 3 prefixes · 1.54K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| SE | Sweden | 3 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS5601- Registry name
- UNSPECIFIED
- Registrant
- AS5601-MNT
- Abuse contact
- abuse@kth.se
- Registered
- 1970-01-01
- Last changed
- 2017-11-15
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 3 with no ROA
- ROAs
- 0 authorising AS5601
- ASPA
- no ASPA record
- IRR
- 100% registered · 3 of 3 announcements
- Route objects
- 14 naming AS5601
Reputation
Classification and threat
Education University, school or national research and education network.
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: 449 networks and 1,846 prefixes, as published 2026-11-03. 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