AS13004 — SOX

AS13004 announces 4 IPv4 prefixes covering 1,024 addresses and 1 IPv6 prefixes.

About this network

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 SOX twice, ZPTA-LAN-B3, and RS-PERKE-20090427, the last registered to an individual trading as an agency.
• Nine of twelve sampled addresses answered. 88.218.139.64 and 91.245.214.64 both return 64.sox.rs, and .127 in each block returns 127.sox.rs.
• Two names belong to content caches: cache.cdn77.com and ggc.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::/32 is 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.rs is 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.

Announced prefixes

• 88.218.139.0/24
• 91.245.214.0/24
• 188.120.127.0/24
• 193.105.163.0/24
• 2001:7f8:1e::/48

Upstream networks

• AS6939 Hurricane Electric LLC
• AS3223 Voxility LLP
• AS2914 NTT America, Inc.
• AS9002 RETN Limited
• AS60733 ZORAN PEROVIC trading as Agencija Perke.NET
• AS8280 SYNAPSECOM S.A. Provider of Telecommunications and Internet Services
• AS24482 SG.GS
• AS49673 Truenetwork LLC
• AS208972 GIBIRNET ILETISIM HIZMETLERI SANAYI VE TICARET LIMITED SIRKETI
• AS57463 NetIX Communications JSC
• AS37721 Virtual Technologies & Solutions
• AS48362 Stadtwerke Feldkirch
• AS50673 Serverius Holding B.V.
• AS31500 Global Network Management Inc

Downstream networks

• AS41897 Sat-Trakt D.O.O.
• AS198371 NINET Company Nis d.o.o.
• AS205620 Unicom-Telecom d.o.o.
• AS9125 Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun
• AS205313 INSPIRA GRUPA DOO SUBOTICA
• AS50872 LOCALHOST d.o.o.
• AS42385 Join-stock company "Internet Exchange"MSK-IX"
• AS203572 Ingram Micro d.o.o. Beograd
• AS25431 Gama Electronics d.o.o.
• AS60733 ZORAN PEROVIC trading as Agencija Perke.NET
• AS9009 M247 Europe SRL
• AS42473 Anexia Cloud Solutions GmbH
• AS216053 Data Cloud Technology d.o.o Kragujevac
• AS1288 Packet Clearing House, Inc.
• AS198691 SPACE Admins d.o.o.
• AS63293 Facebook, Inc.
• AS35779 mCloud doo
• AS42 WoodyNet, Inc.
• AS12459 NETOPS B.V.
• AS213306 Comtrade System Integration doo Belgrade Serbia
• AS205201 Public Service Media Radio Television of Serbia
• AS51859 Mainstream doo Beograd
• AS9119 SOFTNET d.o.o.
• AS39311 Mainstream doo Beograd
• AS32934 Facebook, Inc.

Adjacent networks

• AS6939 Hurricane Electric LLC
• AS41897 Sat-Trakt D.O.O.
• AS198371 NINET Company Nis d.o.o.
• AS12459 NETOPS B.V.
• AS57463 NetIX Communications JSC
• AS3223 Voxility LLP
• AS9125 Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun
• AS50673 Serverius Holding B.V.
• AS9002 RETN Limited
• AS208972 GIBIRNET ILETISIM HIZMETLERI SANAYI VE TICARET LIMITED SIRKETI
• AS205620 Unicom-Telecom d.o.o.
• AS205313 INSPIRA GRUPA DOO SUBOTICA
• AS50872 LOCALHOST d.o.o.
• AS42385 Join-stock company "Internet Exchange"MSK-IX"
• AS24482 SG.GS
• AS48362 Stadtwerke Feldkirch
• AS49673 Truenetwork LLC
• AS8280 SYNAPSECOM S.A. Provider of Telecommunications and Internet Services
• AS37721 Virtual Technologies & Solutions
• AS9009 M247 Europe SRL
• AS2914 NTT America, Inc.
• AS15935 ha-vel internet s.r.o.
• AS203572 Ingram Micro d.o.o. Beograd
• AS60733 ZORAN PEROVIC trading as Agencija Perke.NET
• AS31042 Yettel d.o.o.

Internet exchanges

• NetIX — Sofia, Bulgaria
• Peering.cz — Prague, Czech Republic
• Bulgarian Internet eXchange — Sofia, Bulgaria
• Balkan Internet Exchange — Sofia, Bulgaria
• Serbian Open Exchange — Belgrade, Serbia
• Megaport MegaIX Sofia — Sofia, Bulgaria