Observed topology
AS1853 ACONET ACOnet Backbone
Transit
Upstream networks
Networks observed carrying traffic for AS1853: the AS immediately before it in a routing path. Ranked by how many paths showed the relationship, which reflects how widely it is used, not how much traffic crosses it.
| AS | Network | Type | Families | Paths seen |
|---|---|---|---|---|
| AS6939 | Hurricane Electric LLC | Transit | IPv4 IPv6 | 658 |
| AS1764 | Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH | Unclassified | IPv4 IPv6 | 206 |
| AS20965 | GEANT Vereniging | Unclassified | IPv4 IPv6 | 89 |
| AS21320 | GEANT Vereniging | Unclassified | IPv4 IPv6 | 79 |
| AS9002 | RETN Limited | Unclassified | IPv4 IPv6 | 64 |
| AS2852 | CESNET z.s.p.o. | Education | IPv4 IPv6 | 35 |
| AS33891 | Core-Backbone GmbH | Hosting | IPv4 IPv6 | 19 |
| AS3303 | Swisscom (Schweiz) AG | Residential | IPv4 IPv6 | 19 |
| AS48362 | Stadtwerke Feldkirch | Residential | IPv4 IPv6 | 19 |
| AS2607 | Zdruzenie pouzivatelov Slovenskej akademickej datovej siete SANET | Education | IPv4 | 8 |
| AS15935 | ha-vel internet s.r.o. | Unclassified | IPv4 IPv6 | 2 |
| AS57463 | NetIX Communications JSC | Unclassified | IPv4 | 1 |
| AS13030 | Init7 (Switzerland) Ltd. | Hosting | IPv6 | 1 |
Inferred from path position, not from any declaration by either party. A network appearing here is carrying these routes; whether that is a paid transit arrangement, a backup, or something else is not something routing data can tell you.
Transit
Downstream networks
Networks for which AS1853 was observed as the last hop before the origin, meaning it appears to provide them transit.
| AS | Network | Type | Families | Paths seen |
|---|---|---|---|---|
| AS760 | Vienna University | Unclassified | IPv4 | 490 |
| AS1205 | University Linz | Unclassified | IPv4 IPv6 | 318 |
| AS47515 | Bundesministerium fuer Inneres, Sektion IV | Unclassified | IPv4 IPv6 | 236 |
| AS51066 | Austro Control Oesterreichische Gesellschaft fuer Zivilluftfahrt mit beschraenkter Haftung | Unclassified | IPv4 IPv6 | 206 |
| AS39837 | Verein zur Foerderung von Netzwerkkunst | Unclassified | IPv4 IPv6 | 179 |
| AS210543 | Steiermaerkische Krankenanstaltengesellschaft mbH | Unclassified | IPv4 IPv6 | 178 |
| AS42685 | Bundeskanzleramt | Unclassified | IPv4 | 175 |
| AS39057 | DVT-Daten-Verarbeitung-Tirol GmbH | Unclassified | IPv4 IPv6 | 172 |
| AS208740 | Bundesministerium fuer europaeische und internationale Angelegenheiten | Unclassified | IPv4 IPv6 | 150 |
| AS12991 | Amt der Ooe. Landesregierung | Unclassified | IPv4 IPv6 | 149 |
| AS8692 | Bundesrechenzentrum GmbH | Unclassified | IPv4 IPv6 | 143 |
| AS679 | Technische Universitat Wien | Unclassified | IPv4 | 141 |
| AS12762 | Vorarlberger Informatik- und Telekommunikationsdienstleistungsgesellschaft mbH | Unclassified | IPv4 IPv6 | 134 |
| AS1288 | Packet Clearing House, Inc. | Unclassified | IPv4 IPv6 | 130 |
| AS34883 | FH JOANNEUM Gesellschaft mbH | Unclassified | IPv4 IPv6 | 108 |
| AS2494 | IDDQD-AS | Unclassified | IPv4 IPv6 | 108 |
| AS206021 | Wirtschaftskammer Steiermark | Unclassified | IPv4 IPv6 | 105 |
| AS2852 | CESNET z.s.p.o. | Education | IPv4 | 104 |
| AS2488 | International Institute for Applied Systems Analysis | Unclassified | IPv4 IPv6 | 95 |
| AS30971 | nic.at GmbH | Unclassified | IPv4 | 85 |
| AS51350 | Fachhochschule Technikum Wien | Unclassified | IPv4 IPv6 | 78 |
| AS6720 | Magistrat der Stadt Wien, Magistratsabteilung 01 | Unclassified | IPv4 IPv6 | 74 |
| AS1112 | IDDQD-AS | Unclassified | IPv4 | 70 |
| AS1113 | Technische Universitaet Graz | Unclassified | IPv4 | 70 |
| AS1776 | Vienna University of Economics and Business | Unclassified | IPv4 | 70 |
| AS1110 | IDDQD-AS | Unclassified | IPv4 | 70 |
| AS1109 | Universitaet Salzburg | Unclassified | IPv4 | 70 |
| AS1117 | Universitaet fur Bodenkultur, Wien | Unclassified | IPv4 | 70 |
| AS1114 | IDDQD-AS | Unclassified | IPv4 | 70 |
| AS1111 | Universitaet Klagenfurt | Unclassified | IPv4 | 70 |
| AS2036 | Joanneum Research Forschungsgesellschaft mbH | Unclassified | IPv4 | 70 |
| AS41915 | Land-, forst- und wasserwirtschaftliches Rechenzentrum GmbH | Unclassified | IPv4 | 70 |
| AS213181 | CEU GmbH | Unclassified | IPv4 | 70 |
| AS207653 | Rechnungshof Oesterreich | Unclassified | IPv4 | 70 |
| AS1115 | IDDQD-AS | Unclassified | IPv4 | 70 |
| AS206571 | Land Burgenland | Unclassified | IPv4 | 67 |
| AS208441 | Amt der Salzburger Landesregierung | Unclassified | IPv4 IPv6 | 60 |
| AS6883 | Parlamentsdirektion | Unclassified | IPv4 | 40 |
| AS213080 | Oberoesterreichische Gesundheitsholding GmbH | Unclassified | IPv6 | 38 |
| AS215422 | Stadt Dornbirn | Unclassified | IPv4 | 37 |
| AS2604 | Graz University of Music and Performing Arts | Education | IPv6 | 37 |
| AS211817 | Wirtschafts- und Sozialwissenschaftliches Rechenzentrum | Unclassified | IPv4 | 33 |
| AS2607 | Zdruzenie pouzivatelov Slovenskej akademickej datovej siete SANET | Education | IPv4 | 33 |
| AS13042 | Oesterreichische Nationalbank | Unclassified | IPv4 | 29 |
| AS20537 | der NOe Landesregierung | Unclassified | IPv4 | 28 |
| AS35052 | ACONET | Unclassified | IPv4 | 16 |
| AS34183 | Bundesministerium f. Gesundheit | Unclassified | IPv4 IPv6 | 15 |
| AS200070 | CZ.NIC, z.s.p.o. | Unclassified | IPv4 IPv6 | 14 |
| AS207131 | Stadtgemeinde Leoben | Unclassified | IPv4 | 10 |
| AS8501 | Institute of Bioorganic Chemistry Polish Academy of Science, Poznan Supercomputing and Networking Center | Education | IPv4 | 6 |
Adjacency
Adjacent networks
Every AS seen directly next to AS1853 in a routing path, in either direction.
| AS | Network | Type | Families | Paths seen |
|---|---|---|---|---|
| AS6939 | Hurricane Electric LLC | Transit | IPv4 IPv6 | 3,447 |
| AS1764 | Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH | Unclassified | IPv4 IPv6 | 1,026 |
| AS20965 | GEANT Vereniging | Unclassified | IPv4 IPv6 | 538 |
| AS760 | Vienna University | Unclassified | IPv4 IPv6 | 530 |
| AS21320 | GEANT Vereniging | Unclassified | IPv4 IPv6 | 519 |
| AS9002 | RETN Limited | Unclassified | IPv4 IPv6 | 472 |
| AS2852 | CESNET z.s.p.o. | Education | IPv4 IPv6 | 407 |
| AS1205 | University Linz | Unclassified | IPv4 IPv6 | 318 |
| AS47515 | Bundesministerium fuer Inneres, Sektion IV | Unclassified | IPv4 IPv6 | 236 |
| AS51066 | Austro Control Oesterreichische Gesellschaft fuer Zivilluftfahrt mit beschraenkter Haftung | Unclassified | IPv4 IPv6 | 206 |
| AS39837 | Verein zur Foerderung von Netzwerkkunst | Unclassified | IPv4 IPv6 | 179 |
| AS210543 | Steiermaerkische Krankenanstaltengesellschaft mbH | Unclassified | IPv4 IPv6 | 178 |
| AS42685 | Bundeskanzleramt | Unclassified | IPv4 | 175 |
| AS39057 | DVT-Daten-Verarbeitung-Tirol GmbH | Unclassified | IPv4 IPv6 | 172 |
| AS208740 | Bundesministerium fuer europaeische und internationale Angelegenheiten | Unclassified | IPv4 IPv6 | 150 |
| AS12991 | Amt der Ooe. Landesregierung | Unclassified | IPv4 IPv6 | 149 |
| AS8692 | Bundesrechenzentrum GmbH | Unclassified | IPv4 IPv6 | 146 |
| AS679 | Technische Universitat Wien | Unclassified | IPv4 | 141 |
| AS1113 | Technische Universitaet Graz | Unclassified | IPv4 | 140 |
| AS12762 | Vorarlberger Informatik- und Telekommunikationsdienstleistungsgesellschaft mbH | Unclassified | IPv4 IPv6 | 134 |
| AS1288 | Packet Clearing House, Inc. | Unclassified | IPv4 IPv6 | 130 |
| AS34883 | FH JOANNEUM Gesellschaft mbH | Unclassified | IPv4 IPv6 | 108 |
| AS2494 | IDDQD-AS | Unclassified | IPv4 IPv6 | 108 |
| AS206021 | Wirtschaftskammer Steiermark | Unclassified | IPv4 IPv6 | 105 |
| AS2488 | International Institute for Applied Systems Analysis | Unclassified | IPv4 IPv6 | 95 |
| AS30971 | nic.at GmbH | Unclassified | IPv4 | 85 |
| AS48362 | Stadtwerke Feldkirch | Residential | IPv4 IPv6 | 78 |
| AS51350 | Fachhochschule Technikum Wien | Unclassified | IPv4 IPv6 | 78 |
| AS6720 | Magistrat der Stadt Wien, Magistratsabteilung 01 | Unclassified | IPv4 IPv6 | 74 |
| AS41915 | Land-, forst- und wasserwirtschaftliches Rechenzentrum GmbH | Unclassified | IPv4 | 70 |
| AS1776 | Vienna University of Economics and Business | Unclassified | IPv4 | 70 |
| AS1110 | IDDQD-AS | Unclassified | IPv4 | 70 |
| AS1109 | Universitaet Salzburg | Unclassified | IPv4 | 70 |
| AS1117 | Universitaet fur Bodenkultur, Wien | Unclassified | IPv4 | 70 |
| AS1114 | IDDQD-AS | Unclassified | IPv4 | 70 |
| AS1111 | Universitaet Klagenfurt | Unclassified | IPv4 | 70 |
| AS2036 | Joanneum Research Forschungsgesellschaft mbH | Unclassified | IPv4 | 70 |
| AS213181 | CEU GmbH | Unclassified | IPv4 | 70 |
| AS207653 | Rechnungshof Oesterreich | Unclassified | IPv4 | 70 |
| AS1112 | IDDQD-AS | Unclassified | IPv4 | 70 |
| AS1115 | IDDQD-AS | Unclassified | IPv4 | 70 |
| AS3303 | Swisscom (Schweiz) AG | Residential | IPv4 IPv6 | 69 |
| AS206571 | Land Burgenland | Unclassified | IPv4 | 67 |
| AS208441 | Amt der Salzburger Landesregierung | Unclassified | IPv4 IPv6 | 60 |
| AS33891 | Core-Backbone GmbH | Hosting | IPv4 IPv6 | 58 |
| AS57463 | NetIX Communications JSC | Unclassified | IPv4 | 52 |
| AS8501 | Institute of Bioorganic Chemistry Polish Academy of Science, Poznan Supercomputing and Networking Center | Education | IPv4 | 51 |
| AS2607 | Zdruzenie pouzivatelov Slovenskej akademickej datovej siete SANET | Education | IPv4 | 51 |
| AS6883 | Parlamentsdirektion | Unclassified | IPv4 | 40 |
| AS213080 | Oberoesterreichische Gesundheitsholding GmbH | Unclassified | IPv6 | 38 |
| AS2604 | Graz University of Music and Performing Arts | Education | IPv6 | 37 |
| AS215422 | Stadt Dornbirn | Unclassified | IPv4 | 37 |
| AS211817 | Wirtschafts- und Sozialwissenschaftliches Rechenzentrum | Unclassified | IPv4 | 33 |
| AS13042 | Oesterreichische Nationalbank | Unclassified | IPv4 | 29 |
| AS20537 | der NOe Landesregierung | Unclassified | IPv4 | 28 |
| AS35052 | ACONET | Unclassified | IPv4 | 16 |
| AS34183 | Bundesministerium f. Gesundheit | Unclassified | IPv4 IPv6 | 15 |
| AS200070 | CZ.NIC, z.s.p.o. | Unclassified | IPv4 IPv6 | 14 |
| AS207131 | Stadtgemeinde Leoben | Unclassified | IPv4 | 10 |
| AS1120 | ACONET | Unclassified | IPv4 | 7 |
| AS35492 | Verein zur Foerderung freier Netze | Unclassified | IPv4 | 5 |
| AS15935 | ha-vel internet s.r.o. | Unclassified | IPv4 IPv6 | 2 |
| AS13030 | Init7 (Switzerland) Ltd. | Hosting | IPv6 | 1 |
Adjacency is not the same as peering. Being next to each other in a path covers paid transit, settlement-free peering and customer connections alike, and routing data cannot distinguish them. Treat this as "these networks exchange routes", nothing more specific.
Interconnection
Exchange presence
Internet exchanges where Packet Clearing House has a port recorded for AS1853, largest fabric first. An exchange is shared switching where networks interconnect directly rather than paying a transit provider to carry traffic between them, so turning up at one is a deliberate choice about how this network wants to be reached. Each name opens that exchange's own page, with its peering LANs and every other network recorded on it. Recorded at 1 exchange across 1 country and 1 region.
| Exchange | Location | Their address | Member ports |
|---|---|---|---|
| Vienna Internet Exchange | Vienna, Austria | 193.203.0.1 | 188 |
Unlike the tables above, this is recorded rather than inferred. An address on a peering LAN is at that exchange by definition. Two carve-outs all the same. Member ports counts every participant at the exchange, not this network's ports, so read it as a size proxy. And an absent exchange means PCH has no record of it, not that the network is not there.
Provenance
Where this comes from
Derived from routing tables collected at 2026-08-09 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 74.03M route entries. These are observations from those vantage points, not a complete or authoritative view of the internet.
Cross-check against RIPEstat or BGP.tools, which observe from a different and larger set of vantage points.
Exchange presence comes from a separate dataset: the directory collected 2026-08-09 by Packet Clearing House (https://www.pch.net/ixp/data), covering 1,327 exchanges and 93,164 recorded member ports, licensed CC BY-NC-SA 3.0.
PeeringDB is the better-known directory and is deliberately not the source here: its acceptable-use policy forbids the bulk storage this needs. The two answer different questions anyway. PeeringDB reports what an operator declares about itself; this reports what PCH has recorded.