Observed topology
AS6325 ILLINOIS-CENTURY
Transit
Upstream networks
Networks observed carrying traffic for AS6325: 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 |
|---|---|---|---|---|
| AS174 | Cogent Communications, LLC | Transit | IPv4 IPv6 | 1,826 |
| AS6461 | Zayo Bandwidth | Transit | IPv4 IPv6 | 901 |
| AS32787 | Akamai Technologies, Inc. | Hosting | IPv4 | 468 |
| AS6939 | Hurricane Electric LLC | Transit | IPv4 IPv6 | 409 |
| AS22335 | Metropolitan Research and Education Network | Unclassified | IPv4 IPv6 | 371 |
| AS7018 | AT&T Enterprises, LLC | Residential | IPv4 IPv6 | 187 |
| AS293 | ESnet | Unclassified | IPv4 | 21 |
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 AS6325 was observed as the last hop before the origin, meaning it appears to provide them transit.
| AS | Network | Type | Families | Paths seen |
|---|---|---|---|---|
| AS394534 | City of Chicago | Unclassified | IPv4 | 617 |
| AS46286 | Cook County | Unclassified | IPv4 | 279 |
| AS397112 | Illinois Mathematics and Science Academy | Unclassified | IPv4 | 279 |
| AS53695 | Southern Illinois University at Edwardsville | Unclassified | IPv4 | 240 |
| AS19070 | Eastern Illinois University | Unclassified | IPv4 | 186 |
| AS22887 | Western Illinois University | Unclassified | IPv4 | 124 |
| AS33460 | Waubonsee Community College | Unclassified | IPv4 | 121 |
| AS395433 | Township High School District 214 | Unclassified | IPv4 | 118 |
| AS32344 | Community High School District 99 | Unclassified | IPv4 | 116 |
| AS26255 | Oakton Community College | Unclassified | IPv4 | 97 |
| AS33019 | Wheaton College | Unclassified | IPv4 | 93 |
| AS10308 | Northeastern Illinois University | Education | IPv4 | 79 |
| AS29993 | North Central College | Unclassified | IPv4 | 71 |
| AS63056 | Hoopeston Area Schools | Unclassified | IPv4 IPv6 | 65 |
| AS394797 | Millikin University | Unclassified | IPv4 | 63 |
| AS15118 | Southern Illinois University - School of Medicine | Unclassified | IPv4 | 62 |
| AS22978 | Governors State University | Unclassified | IPv4 | 62 |
| AS394026 | Village of Schaumburg | Unclassified | IPv4 | 59 |
| AS1416 | Chicago Public Schools | Unclassified | IPv4 | 59 |
| AS15337 | Wm. Rainey Harper College | Unclassified | IPv4 | 59 |
| AS22666 | Glenbrook High School District | Unclassified | IPv4 | 59 |
| AS394798 | Chicago Park District | Unclassified | IPv4 | 59 |
| AS1702 | CHICAGO STATE UNIVERSITY | Unclassified | IPv4 | 59 |
| AS395847 | Maine Township High School District 207 | Unclassified | IPv4 | 59 |
| AS23427 | Glenbard HSD #87 | Unclassified | IPv4 | 58 |
| AS22272 | -Reserved AS- | Unclassified | IPv4 | 57 |
| AS11417 | Northern Illinois University | Education | IPv4 | 43 |
| AS53643 | Manteno Community Unit School District 5 | Unclassified | IPv4 | 37 |
| AS29885 | Univeristy of Chicago Hospitals & Health System | Unclassified | IPv4 | 37 |
| AS40038 | Moraine Valley Community College | Unclassified | IPv4 | 29 |
| AS19480 | CHICAGO PUBLIC LIBRARY | Unclassified | IPv4 | 26 |
| AS17196 | College of duPage | Unclassified | IPv4 | 22 |
| AS394031 | South Suburban College of Cook County | Unclassified | IPv4 | 19 |
| AS53642 | Central Community Unit School District 301 | Unclassified | IPv4 | 18 |
| AS395068 | McHenry County College District 528 | Unclassified | IPv4 | 18 |
| AS26367 | Bradley University | Unclassified | IPv4 | 14 |
| AS394241 | Murphysboro Community Unit School District No. 186 | Unclassified | IPv4 | 12 |
| AS6200 | University of Illinois Chicago | Education | IPv4 | 7 |
| AS32464 | University Of Illinois College Of Medicine At Peoria | Unclassified | IPv4 | 3 |
| AS32294 | City of Champaign, Illinois | Unclassified | IPv4 | 3 |
| AS40710 | College of Lake County | Unclassified | IPv4 | 3 |
| AS7386 | Illinois State University | Education | IPv4 | 3 |
Adjacency
Adjacent networks
Every AS seen directly next to AS6325 in a routing path, in either direction.
| AS | Network | Type | Families | Paths seen |
|---|---|---|---|---|
| AS174 | Cogent Communications, LLC | Transit | IPv4 IPv6 | 3,182 |
| AS6461 | Zayo Bandwidth | Transit | IPv4 IPv6 | 2,382 |
| AS6939 | Hurricane Electric LLC | Transit | IPv4 IPv6 | 682 |
| AS394534 | City of Chicago | Unclassified | IPv4 | 617 |
| AS22335 | Metropolitan Research and Education Network | Unclassified | IPv4 IPv6 | 573 |
| AS32787 | Akamai Technologies, Inc. | Hosting | IPv4 | 468 |
| AS7018 | AT&T Enterprises, LLC | Residential | IPv4 IPv6 | 393 |
| AS46286 | Cook County | Unclassified | IPv4 | 279 |
| AS397112 | Illinois Mathematics and Science Academy | Unclassified | IPv4 | 279 |
| AS53695 | Southern Illinois University at Edwardsville | Unclassified | IPv4 | 240 |
| AS19070 | Eastern Illinois University | Unclassified | IPv4 | 186 |
| AS22887 | Western Illinois University | Unclassified | IPv4 | 124 |
| AS33460 | Waubonsee Community College | Unclassified | IPv4 | 121 |
| AS395433 | Township High School District 214 | Unclassified | IPv4 | 118 |
| AS32344 | Community High School District 99 | Unclassified | IPv4 | 116 |
| AS11417 | Northern Illinois University | Education | IPv4 | 103 |
| AS26255 | Oakton Community College | Unclassified | IPv4 | 97 |
| AS33019 | Wheaton College | Unclassified | IPv4 | 93 |
| AS10308 | Northeastern Illinois University | Education | IPv4 | 79 |
| AS29993 | North Central College | Unclassified | IPv4 | 71 |
| AS63056 | Hoopeston Area Schools | Unclassified | IPv4 IPv6 | 65 |
| AS394797 | Millikin University | Unclassified | IPv4 | 63 |
| AS22978 | Governors State University | Unclassified | IPv4 | 62 |
| AS15118 | Southern Illinois University - School of Medicine | Unclassified | IPv4 | 62 |
| AS22666 | Glenbrook High School District | Unclassified | IPv4 | 59 |
| AS1416 | Chicago Public Schools | Unclassified | IPv4 | 59 |
| AS394798 | Chicago Park District | Unclassified | IPv4 | 59 |
| AS15337 | Wm. Rainey Harper College | Unclassified | IPv4 | 59 |
| AS395847 | Maine Township High School District 207 | Unclassified | IPv4 | 59 |
| AS1702 | CHICAGO STATE UNIVERSITY | Unclassified | IPv4 | 59 |
| AS394026 | Village of Schaumburg | Unclassified | IPv4 | 59 |
| AS23427 | Glenbard HSD #87 | Unclassified | IPv4 | 58 |
| AS22272 | -Reserved AS- | Unclassified | IPv4 | 57 |
| AS293 | ESnet | Unclassified | IPv4 | 54 |
| AS53643 | Manteno Community Unit School District 5 | Unclassified | IPv4 | 37 |
| AS29885 | Univeristy of Chicago Hospitals & Health System | Unclassified | IPv4 | 37 |
| AS40038 | Moraine Valley Community College | Unclassified | IPv4 | 29 |
| AS19480 | CHICAGO PUBLIC LIBRARY | Unclassified | IPv4 | 26 |
| AS17196 | College of duPage | Unclassified | IPv4 | 22 |
| AS394031 | South Suburban College of Cook County | Unclassified | IPv4 | 19 |
| AS395068 | McHenry County College District 528 | Unclassified | IPv4 | 18 |
| AS53642 | Central Community Unit School District 301 | Unclassified | IPv4 | 18 |
| AS26367 | Bradley University | Unclassified | IPv4 | 14 |
| AS394241 | Murphysboro Community Unit School District No. 186 | Unclassified | IPv4 | 12 |
| AS6200 | University of Illinois Chicago | Education | IPv4 | 7 |
| AS40710 | College of Lake County | Unclassified | IPv4 | 3 |
| AS7386 | Illinois State University | Education | IPv4 | 3 |
| AS32464 | University Of Illinois College Of Medicine At Peoria | Unclassified | IPv4 | 3 |
| AS6327 | Shaw Communications | Residential | IPv4 | 3 |
| AS32294 | City of Champaign, Illinois | Unclassified | IPv4 | 3 |
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 AS6325, 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 3 exchanges across 1 country and 1 region.
| Exchange | Location | Their address | Member ports |
|---|---|---|---|
| Equinix Internet Exchange Chicago | Chicago, United States | 208.115.136.22 | 280 |
| MidWest-IX - St. Louis | St. Louis, United States | 2001:504:45:10::9 | 18 |
| FD-IX - St. Louis | St. Louis, United States | 206.71.10.9 | 15 |
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.