Autonomous system
AS13004 SOX
Unclassified RIPE
Summary
Serbian Open Exchange
infrastructure transit business
An internet exchange: 938 neighbours standing behind 1,024 addresses.
What it's used for
- The Serbian Open Exchange, a national internet exchange point. 1,024 addresses across four IPv4 prefixes, one IPv6 prefix, and 938 observed BGP neighbours.
Notable
- The IPv6 prefix is
2001:7f8:1e::/48, inside the range RIPE sets aside for exchange peering LANs. - Netnames are
SOXtwice,ZPTA-LAN-B3, andRS-PERKE-20090427, the last registered to an individual trading as an agency. - Nine of twelve sampled addresses answered.
88.218.139.64and91.245.214.64both return64.sox.rs, and.127in each block returns127.sox.rs. - Two names belong to content caches:
cache.cdn77.comandggc.sox.rs.
Interesting
- Neighbour count nearly equals address count, a shape only an exchange produces. Every member that peers across the fabric appears as an adjacency, while the fabric itself needs only enough addresses to number the ports.
2001:7f8::/32is reserved for peering LANs, so the IPv6 prefix identifies this as an exchange before anyone reads the name.- The same reverse names serve two different blocks. The zone was generated from the last octet alone, with no component identifying which block it belongs to, so
64.sox.rsis ambiguous by construction and names a port position rather than a host. - Content caches sitting inside exchange space are the modern exchange's real draw: members join for the peering and stay for the local copy of the traffic-heavy platforms.
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 7 exchanges in 4 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| NetIX | Sofia, Bulgaria | 185.1.226.152 |
| Peering.cz | Prague, Czech Republic | 185.0.20.90 |
| Bulgarian Internet eXchange | Sofia, Bulgaria | 193.169.198.73 |
| Balkan Internet Exchange | Sofia, Bulgaria | 185.1.30.75 |
| Serbian Open Exchange | Belgrade, Serbia | 185.1.27.1 |
| IXP.mk | Skopje, North Macedonia | 185.1.121.119 |
| Megaport MegaIX Sofia | Sofia, Bulgaria | 91.212.235.83 |
Transit providers
14 upstream, 34 downstream and 84 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 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 4 prefixes · 1.02K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| RS | Serbia | 5 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS13004- Registry name
- SOX
- Registrant
- BERI-MNT
- Abuse contact
- info@sox.rs
- Registered
- 2010-02-26
- Last changed
- 2026-09-08
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 5 valid, 0 with no ROA
- ROAs
- 5 authorising AS13004
- ASPA
- no ASPA record
- IRR
- 100% registered · 5 of 5 announcements
- Route objects
- 6 naming AS13004
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: 436 networks and 1,771 prefixes, as published 2026-10-13. 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