ua-tracer
by Paul Kinlan
ua-tracer
what does a user agent actually fetch, follow & run?
This page just minted a fresh trace id kT0c2JO1. Every asset it references
lives under /r/kT0c2JO1/mTf5xW6T/…, 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 "NimbleForagerBot/8.2" 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 5469 homepage requests, grouped by user agent. Click one to filter the list below.
| User Agent | Requests | JS ran |
|---|---|---|
(no user-agent) |
1128 | 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 |
359 | 0 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36 |
105 | 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 |
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 |
70 | 2 |
Feedbox/1.0 (+https://github.com/feedbox) |
59 | 0 |
curl/8.20.0 |
57 | 0 |
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot |
53 | 0 |
Mozilla/5.0 (compatible; Drupalbot; +https://www.drupal.org) |
49 | 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 |
49 | 0 |
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.36 |
46 | 37 |
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 |
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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 |
33 | 2 |
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 (compatible; YandexBot/3.0; +http://yandex.com/bots) |
30 | 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 |
29 | 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 |
27 | 26 |
Dalvik/2.1.0 (Linux; U; Android 9.0; ZTE BA520 Build/MRA58K) |
23 | 0 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.3 |
23 | 0 |
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/149.0.0.0 Safari/537.36 |
23 | 23 |
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 |
23 | 0 |
View all 1294 user agents (paged) →
Recent homepage requests
Newest first. Each row is a single load of / by some user agent.
| Timestamp | User Agent | Assets |
|---|---|---|
| 2026-07-27 18:31:32.684 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-07-27 18:17:24.595 UTC | Mozilla/5.0 (Linux; Android 9; STK-LX3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Mobile Safari/537.36 |
0 |
no JS— | ||
| 2026-07-27 18:05:10.502 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 17:35:10.871 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 17:12:52.253 UTC | Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0 |
0 |
no JS— | ||
| 2026-07-27 17:05:10.176 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 16:35:11.336 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 16:11:42.666 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 |
1 |
no JSog-img | ||
| 2026-07-27 16:05:10.031 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 15:45:07.220 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— | ||
| 2026-07-27 15:35:11.078 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 15:13:10.015 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36 |
1 |
no JSimg | ||
| 2026-07-27 15:05:24.362 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— | ||
| 2026-07-27 15:05:10.236 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 14:44:27.917 UTC | Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/) |
13 |
no JSCSSJSmoduleimgfontcss-fontog-imgiframe@import | ||
| 2026-07-27 14:35:58.272 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— | ||
| 2026-07-27 14:35:12.168 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 14:21:06.492 UTC | OhDear.app (+https://ohdear.app/docs/features/broken-links-detection) |
0 |
no JS— | ||
| 2026-07-27 14:05:10.125 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 13:41:29.330 UTC | Feedbox/1.0 (+https://github.com/feedbox) |
0 |
no JS— | ||
| 2026-07-27 13:39:42.993 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— | ||
| 2026-07-27 13:35:10.907 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 13:30:46.561 UTC | Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0 |
1 |
no JSfavicon | ||
| 2026-07-27 13:16:04.217 UTC | Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.7871.128 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) |
6 |
no JS✓ GooglebotCSSJSmoduleprefetchiframe@import | ||
| 2026-07-27 13:11:19.349 UTC | Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07) |
0 |
no JS— | ||
| 2026-07-27 13:05:55.125 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— | ||
| 2026-07-27 13:05:10.249 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 12:59:58.721 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— | ||
| 2026-07-27 12:55:22.065 UTC | Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/) |
0 |
no JS— | ||
| 2026-07-27 12:35:11.133 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 12:34:55.931 UTC | Mozilla/5.0 (Linux; Android 10; MI 8 Build/QKQ1.190828.002) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Mobile Safari/537.36 YaApp_Android/10.61 YaSearchBrowser/10.61 |
0 |
no JS— | ||
| 2026-07-27 12:25:36.790 UTC | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-07-27 12:05:10.330 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 11:35:11.156 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 11:29:55.916 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; GoogleOther) Chrome/150.0.7871.128 Safari/537.36 |
0 |
no JS— | ||
| 2026-07-27 11:14:55.623 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— | ||
| 2026-07-27 11:11:34.062 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— | ||
| 2026-07-27 11:05:10.704 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 10:37:11.404 UTC | Mozilla/5.0 (X11; Ubuntu; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.6367.82 Safari/537.36 |
0 |
no JS— | ||
| 2026-07-27 10:35:10.799 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 10:32:30.764 UTC | Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0 |
0 |
no JS— | ||
| 2026-07-27 10:31:34.989 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.6723.70 Safari/537.36 |
0 |
no JS— | ||
| 2026-07-27 10:29:15.294 UTC | Mozilla/5.0 (Linux; Android 11; CHL-AN00 Build/HONORCHL-AN00;) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/97.0.4692.98 Mobile Safari/537.36 T7/13.38 SP-engine/2.76.0 languageType/0 bdh_dvt/0 bdh_de/1 bdh_ds/1 bdapp/1.0 (bdhonorbrowser; bdhonorbrowser) bdhonorbrowser/9.8.0.3 (P1 11) NABar/1.0 |
3 |
no JSCSSJSmodule | ||
| 2026-07-27 10:21:13.114 UTC | Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0 |
0 |
no JS— | ||
| 2026-07-27 10:16:59.816 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 Edg/122.0.0.0 |
0 |
no JS— | ||
| 2026-07-27 10:05:11.260 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 10:05:06.853 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— | ||
| 2026-07-27 09:49:04.514 UTC | Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.6998.45 Safari/537.36 |
0 |
no JS— | ||
| 2026-07-27 09:35:10.852 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-27 09:34:20.715 UTC | Feedbox/1.0 (+https://github.com/feedbox) |
0 |
no JS— | ||
