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  31,447 live websites   that are using ATS.

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Technology usage statistics

Websites using ATS31,447 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+893
Websites that dropped ATS-1,082
Websites that changed version of ATS99

Security vulnerabilites


PublishedCVEWebsites
Oct, 2023Apache Traffic Server: Malformed http/2 frames can cause an abort560
Oct, 2023Apache Traffic Server: s3_auth plugin problem with hash calculation651
Aug, 2023Apache Traffic Server: Invalid Range header causes a crash1,404
Aug, 2023Apache Traffic Server: Differential fuzzing for HTTP request parsing discrepancies1,404
Jun, 2023Apache Traffic Server: The TRACE method can be use to disclose network information598
Jun, 2023Apache Traffic Server: Configuration option to block the PUSH method in ATS didn't work598
Jun, 2023Apache Traffic Server: s3_auth plugin problem with hash calculation598
Dec, 2022Apache Traffic Server: Improperly handled requests can cause crashes in specific plugins321
Dec, 2022Apache Traffic Server: Improperly reading the client requests321
Dec, 2022Apache Traffic Server: Security issues with the xdebug plugin219

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 24,381,942 domains found using Apache
Nginx: Total 21,390,486 domains found using Nginx
Cloudflare Server: Total 6,909,080 domains found using Cloudflare Server
OpenResty: Total 4,193,168 domains found using OpenResty
LiteSpeed: Total 4,066,681 domains found using LiteSpeed
IIS: Total 2,897,461 domains found using IIS
Pepyaka: Total 1,801,043 domains found using Pepyaka
Microsoft HTTPAPI: Total 626,273 domains found using Microsoft HTTPAPI
GHS: Total 276,272 domains found using GHS
Cowboy: Total 256,873 domains found using Cowboy





Alternative Names

  • ATS



Major Versions

  • 3.xx (3 subversions, 65 domains)
  • 4.xx (2 subversions, 5 domains)
  • 5.xx (4 subversions, 150 domains)
  • 6.xx (5 subversions, 507 domains)
  • 7.xx (9 subversions, 79 domains)
  • 8.xx (10 subversions, 102 domains)
  • 9.xx (8 subversions, 773 domains)