ua-tracer
by Paul Kinlan
ua-tracer
what does a user agent actually fetch, follow & run?
This page just minted a fresh trace id m61oOY7V. Every asset it references
lives under /r/m61oOY7V/RLo3AJi5/…, 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 "AmberMagpieBot/3.9" 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 12421 homepage requests, grouped by user agent. Click one to filter the list below.
| User Agent | Requests | JS ran |
|---|---|---|
(no user-agent) |
3813 | 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 |
1019 | 1 |
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot |
337 | 0 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 |
160 | 2 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36 |
123 | 0 |
Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots) |
119 | 0 |
Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/) |
110 | 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) |
93 | 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 |
90 | 2 |
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 |
78 | 0 |
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 |
71 | 1 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 |
64 | 1 |
curl/8.20.0 |
57 | 0 |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 |
57 | 0 |
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36 |
55 | 6 |
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 |
54 | 0 |
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.36 |
52 | 40 |
Mozilla/5.0 (compatible; Drupalbot; +https://www.drupal.org) |
49 | 0 |
Go-http-client/1.1 |
47 | 0 |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1 Safari/605.1.15 |
46 | 0 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36 |
46 | 0 |
OhDear.app (+https://ohdear.app/docs/features/broken-links-detection) |
42 | 0 |
argus-rss/1 |
41 | 0 |
facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
41 | 0 |
View all 1718 user agents (paged) →
Recent homepage requests
Newest first. Each row is a single load of / by some user agent.
| Timestamp | User Agent | Assets |
|---|---|---|
| 2026-09-24 21:52:32.913 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com) |
0 |
no JS✓ ClaudeBot— | ||
| 2026-09-24 21:47:55.567 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— | ||
| 2026-09-24 21:34:15.692 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 21:04:15.135 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 20:34:14.249 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 20:04:16.018 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 19:52:42.381 UTC | User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36 |
0 |
no JS— | ||
| 2026-09-24 19:40:17.431 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-09-24 19:34:14.297 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 19:04:13.868 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 18:34:13.563 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 18:04:14.722 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 17:46:36.232 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; GoogleOther) Chrome/153.0.8010.52 Safari/537.36 |
6 |
no JSCSSJSmoduleprefetchiframe@import | ||
| 2026-09-24 17:42:30.870 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 |
1 |
no JSfavicon | ||
| 2026-09-24 17:34:13.802 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 17:04:13.923 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 16:38:20.047 UTC | Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/) |
0 |
no JS— | ||
| 2026-09-24 16:34:14.274 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 16:15:29.274 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— | ||
| 2026-09-24 16:04:14.494 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 15:47:58.858 UTC | Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/153.0.8010.52 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) |
12 |
no JS✓ GooglebotCSSJSmoduleprefetchiframe@import | ||
| 2026-09-24 15:45:59.450 UTC | Mozilla/5.0 (Android 14; Mobile; rv:123.0) Gecko/123.0 Firefox/123 |
0 |
no JS— | ||
| 2026-09-24 15:34:14.683 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 15:32:23.541 UTC | Hello from Palo Alto Networks, find out more about our scans in https://docs-cortex.paloaltonetworks.com/r/1/Cortex-Xpanse/Scanning-activity |
0 |
no JS— | ||
| 2026-09-24 15:04:14.022 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 14:58:45.702 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-09-24 14:42:32.015 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— | ||
| 2026-09-24 14:34:14.288 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 14:04:13.901 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 14:02:18.960 UTC | Mozilla/5.0 (Linux; Android 11; V2164A Build/RP1A.200720.012) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.7680.178 Mobile Safari/537.36 VivoBrowser/31.0.0.1 |
0 |
no JS— | ||
| 2026-09-24 13:46:02.286 UTC | MobileSafari/600.1.4 CFNetwork/711.1.12 Darwin/14.0.0 |
0 |
no JS— | ||
| 2026-09-24 13:41:24.712 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-webindexer/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)) |
0 |
no JS— | ||
| 2026-09-24 13:35:11.282 UTC | Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/155.0.0.0 Mobile Safari/537.36 |
20 |
JS ranCSSJSmoduleimgfontcss-bgcss-fontfaviconapple-iconmanifestpreloadprefetchiframe-img@importCSP reportreport-api | ||
| 2026-09-24 13:34:14.304 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 13:04:14.754 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 12:34:14.606 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 12:05:47.123 UTC | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-09-24 12:04:14.648 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 11:34:13.902 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 11:13:12.087 UTC | Mozilla/5.0 (Macintosh; Intel Mac OS X 11_0_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36 |
7 |
no JSJSmoduleprefetchiframeCSP reportreport-api | ||
| 2026-09-24 11:13:09.002 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 |
1 |
no JSfavicon | ||
| 2026-09-24 11:10:55.838 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 |
0 |
no JS— | ||
| 2026-09-24 11:04:14.080 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 10:45:06.272 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36 |
0 |
no JS✓ Bingbot— | ||
| 2026-09-24 10:39:32.216 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— | ||
| 2026-09-24 10:34:14.247 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 10:04:13.870 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 09:34:14.603 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-09-24 09:30:21.634 UTC | Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/) |
0 |
no JS— | ||
| 2026-09-24 09:27:34.162 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; KeenableBot/1.0; +https://keenable.ai/) |
0 |
no JS— | ||
