ua-tracer
by Paul Kinlan
ua-tracer
what does a user agent actually fetch, follow & run?
This page just minted a fresh trace id SUwK5O15. Every asset it references
lives under /r/SUwK5O15/1ENqm0cO/…, so each fetch is tied back to this request and
your User-Agent. Layered probes inside the CSS and JS reveal whether your UA parses CSS, follows
resources linked from CSS, and actually executes JavaScript.
See what your user agent just did →
Try it: point a crawler at this URL, or run a fresh trace with curl — each load is its own trace:
curl -A "CopperOtterBot/8.3" https://uatracer.com/
…then open the matching row below. A plain curl only records the homepage
hit (it parses no CSS and runs no JS) — that contrast is the whole point.
By user agent
Running counts across all 6811 homepage requests, grouped by user agent. Click one to filter the list below.
| User Agent | Requests | JS ran |
|---|---|---|
(no user-agent) |
1517 | 0 |
Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1 |
548 | 1 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36 |
106 | 0 |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36 |
95 | 88 |
Feedbox/1.0 (+https://github.com/feedbox) |
87 | 0 |
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot |
80 | 0 |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 |
75 | 2 |
curl/8.20.0 |
57 | 0 |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36 |
50 | 0 |
Mozilla/5.0 (compatible; Drupalbot; +https://www.drupal.org) |
49 | 0 |
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.36 |
49 | 40 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36 |
43 | 0 |
facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
41 | 0 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 |
41 | 2 |
Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots) |
37 | 0 |
Go-http-client/1.1 |
35 | 0 |
Mozilla/5.0 (compatible; intel-collector/0.1.0; +https://github.com/enterprise-playbook) |
33 | 0 |
Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/) |
33 | 0 |
OhDear.app (+https://ohdear.app/docs/features/broken-links-detection) |
33 | 0 |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36 |
32 | 0 |
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Mobile Safari/537.36 |
30 | 26 |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11) AppleWebKit/601.1.27 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/601.1.27 |
30 | 0 |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36 |
30 | 28 |
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.36 |
30 | 0 |
argus-rss/1 |
29 | 0 |
View all 1381 user agents (paged) →
Recent homepage requests
Newest first. Each row is a single load of / by some user agent.
| Timestamp | User Agent | Assets |
|---|---|---|
| 2026-08-08 05:16:07.364 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com) |
0 |
no JS✓ ClaudeBot— | ||
| 2026-08-08 05:09:58.474 UTC | Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1 |
0 |
no JS— | ||
| 2026-08-08 05:04:52.200 UTC | argus-rss/1 |
0 |
no JS— | ||
| 2026-08-08 05:04:09.888 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-08 04:56:50.521 UTC | Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1 |
0 |
no JS— | ||
| 2026-08-08 04:39:19.906 UTC | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36; compatible; OAI-SearchBot/1.4; +https://openai.com/searchbot |
2 |
no JS✓ OAI-SearchBotmanifestiframe | ||
| 2026-08-08 04:36:39.881 UTC | Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1 |
0 |
no JS— | ||
| 2026-08-08 04:34:10.055 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-08 04:04:10.397 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-08 03:35:52.335 UTC | Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.7871.186 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) |
6 |
no JS✓ GooglebotCSSJSmoduleprefetchiframe@import | ||
| 2026-08-08 03:34:10.025 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-08 03:04:16.449 UTC | Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1 |
0 |
no JS— | ||
| 2026-08-08 03:04:09.722 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-08 02:34:09.769 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-08 02:22:30.009 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot |
0 |
no JS? ChatGPT-User (no ranges)— | ||
| 2026-08-08 02:04:09.883 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-08 01:52:21.502 UTC | Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1 |
0 |
no JS— | ||
| 2026-08-08 01:34:09.460 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-08 01:11:15.316 UTC | Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1 |
0 |
no JS— | ||
| 2026-08-08 01:08:29.120 UTC | Mozilla/5.0 (compatible; CensysInspect/1.1; +https://about.censys.io/) |
0 |
no JS— | ||
| 2026-08-08 01:04:10.117 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-08 00:56:00.174 UTC | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-08-08 00:34:09.849 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-08 00:04:11.100 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-07 23:58:26.662 UTC | visionheight.com/scan Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) Chrome/126.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-08-07 23:58:07.895 UTC | Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1 |
0 |
no JS— | ||
| 2026-08-07 23:34:10.051 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-07 23:04:12.215 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-07 22:34:10.431 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-07 22:20:26.665 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-08-07 22:16:28.577 UTC | Mozilla/5.0 (compatible; MJ12bot/v2.0.5; http://mj12bot.com/) |
1 |
no JSiframe | ||
| 2026-08-07 22:04:10.047 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-07 21:44:07.728 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.36 |
2 |
no JSimgog-img | ||
| 2026-08-07 21:42:09.739 UTC | argus-rss/1 |
0 |
no JS— | ||
| 2026-08-07 21:34:11.524 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-08-07 21:33:23.219 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:123.0) Gecko/20100101 Firefox/123.0 |
0 |
no JS— | ||
| 2026-08-07 21:14:39.475 UTC | Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/) |
0 |
no JS— | ||
| 2026-08-07 20:14:46.332 UTC | Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1 |
0 |
no JS— | ||
| 2026-08-07 20:05:49.221 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot |
0 |
no JS? ChatGPT-User (no ranges)— | ||
| 2026-08-07 19:57:37.955 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.36 |
2 |
no JSimgog-img | ||
| 2026-08-07 19:39:49.377 UTC | Mozilla/5.0 (compatible; DataForSeoBot/1.0; +https://dataforseo.com/dataforseo-bot) |
0 |
no JS— | ||
| 2026-08-07 19:15:32.411 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36 +https://forestengine.net/#opt-out |
0 |
no JS— | ||
| 2026-08-07 18:31:35.984 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ShapBot/0.1.0 |
5 |
no JSiframeiframe-img | ||
| 2026-08-07 18:31:33.618 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ShapBot/0.1.0 |
0 |
no JS— | ||
| 2026-08-07 17:45:38.988 UTC | Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0 |
13 |
no JSCSSJSmodulefontcss-fontiframe@importCSP report | ||
| 2026-08-07 16:42:15.166 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot |
0 |
no JS? ChatGPT-User (no ranges)— | ||
| 2026-08-07 16:34:42.284 UTC | Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/) |
0 |
no JS— | ||
| 2026-08-07 16:23:51.705 UTC | Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1 |
0 |
no JS— | ||
| 2026-08-07 16:14:54.721 UTC | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-08-07 16:04:50.557 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:123.0) Gecko/20100101 Firefox/123.0 |
0 |
no JS— | ||
