Apache Traffic Server

Category - Web Servers, Reverse Proxy

The Apache Traffic Server (ATS) is a high-performance reverse proxy and forward proxy server. Formerly a commercial product, Yahoo! donated ATS to the Apache Foundation, and it is currently used by several major CDNs and content owners.


We have discovered  31,629 live websites   that are using ATS.

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Technology usage statistics

Websites using ATS31,629 websites
Most popular in the country United States
Market position in Web Servers#27
Market share in Web Servers<0.1%
Most popular version6.2.1

Technology adoption

Recent changes in ATS usage. (See ATS Usage Changes report)
Websites that added ATS+1,183
Websites that dropped ATS-2,060
Websites that changed version of ATS191

Security vulnerabilites


PublishedCVEWebsites
Oct, 2023Apache Traffic Server: Malformed http/2 frames can cause an abort544
Oct, 2023Apache Traffic Server: s3_auth plugin problem with hash calculation643
Aug, 2023Apache Traffic Server: Invalid Range header causes a crash1,419
Aug, 2023Apache Traffic Server: Differential fuzzing for HTTP request parsing discrepancies1,419
Jun, 2023Apache Traffic Server: The TRACE method can be use to disclose network information592
Jun, 2023Apache Traffic Server: Configuration option to block the PUSH method in ATS didn't work592
Jun, 2023Apache Traffic Server: s3_auth plugin problem with hash calculation592
Dec, 2022Apache Traffic Server: Improperly handled requests can cause crashes in specific plugins332
Dec, 2022Apache Traffic Server: Improperly reading the client requests332
Dec, 2022Apache Traffic Server: Security issues with the xdebug plugin222

Apache Traffic Server usage distribution by website rank

The correlation between utilization of ATS technology and the relative popularity of websites

Market Share

ATS market share within the Web Servers category



Geographical Distribution

Technology usage distribution by websites across the globe.



Websites utilizing Apache Traffic Server

Top websites that use ATS
DomainCountryRankContacts
en.wikipedia.org United States53
godaddy.com United States97
finance.yahoo.com United States102
tw.yahoo.com United States162
yahoo.com.tw United States210
yahoo.com United States416
See full domain list

Alternative Technologies


Apache: Total 24,580,947 domains found using Apache
Nginx: Total 22,068,192 domains found using Nginx
Cloudflare Server: Total 6,964,473 domains found using Cloudflare Server
OpenResty: Total 4,135,827 domains found using OpenResty
LiteSpeed: Total 4,135,513 domains found using LiteSpeed
IIS: Total 2,996,559 domains found using IIS
Pepyaka: Total 1,843,374 domains found using Pepyaka
Microsoft HTTPAPI: Total 636,361 domains found using Microsoft HTTPAPI
Cowboy: Total 282,367 domains found using Cowboy
GHS: Total 281,238 domains found using GHS





Alternative Names

  • ATS



Major Versions

  • 3.xx (3 subversions, 69 domains)
  • 4.xx (2 subversions, 5 domains)
  • 5.xx (4 subversions, 147 domains)
  • 6.xx (5 subversions, 498 domains)
  • 7.xx (11 subversions, 108 domains)
  • 8.xx (10 subversions, 110 domains)
  • 9.xx (9 subversions, 728 domains)