ua-tracer
by Paul Kinlan
ua-tracer
what does a user agent actually fetch, follow & run?
This page just minted a fresh trace id McqY1ZfP. Every asset it references
lives under /r/McqY1ZfP/0JpGopeL/…, 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 "RogueHarvesterBot/3.8" 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 4248 homepage requests, grouped by user agent. Click one to filter the list below.
| User Agent | Requests | JS ran |
|---|---|---|
(no user-agent) |
629 | 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 |
222 | 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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36 |
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 |
64 | 2 |
curl/8.20.0 |
57 | 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 |
42 | 33 |
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/89.0.4389.114 Safari/537.36 |
37 | 0 |
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot |
36 | 0 |
Mozilla/5.0 (compatible; intel-collector/0.1.0; +https://github.com/enterprise-playbook) |
33 | 0 |
Go-http-client/1.1 |
32 | 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 |
28 | 0 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 |
28 | 2 |
Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots) |
26 | 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 |
23 | 22 |
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/149.0.0.0 Safari/537.36 |
23 | 23 |
Dalvik/2.1.0 (Linux; U; Android 9.0; ZTE BA520 Build/MRA58K) |
22 | 0 |
Feedbox/1.0 (+https://github.com/feedbox) |
22 | 0 |
Mozilla/5.0 (compatible; GCombinator/1.0; +https://news.gcombinator.com) |
22 | 0 |
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.5 Mobile/15E148 Safari/604.1 |
22 | 16 |
View all 1178 user agents (paged) →
Recent homepage requests
Newest first. Each row is a single load of / by some user agent.
| Timestamp | User Agent | Assets |
|---|---|---|
| 2026-07-17 05:46:04.409 UTC | CCBot/2.0 (https://commoncrawl.org/faq/) |
0 |
no JS— | ||
| 2026-07-17 05:36:42.415 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36 |
0 |
no JS— | ||
| 2026-07-17 05:35:18.227 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-17 05:05:17.897 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-17 04:54:10.269 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36 |
1 |
no JSfavicon | ||
| 2026-07-17 04:45:25.662 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-07-17 04:45:25.579 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-07-17 04:43:51.026 UTC | KeyWord-SKILLS-domain-registration-lookup/1.0 |
0 |
no JS— | ||
| 2026-07-17 04:36:16.462 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36 |
0 |
no JS— | ||
| 2026-07-17 04:35:17.637 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-17 04:21:19.238 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:123.0) Gecko/20100101 Firefox/123.0 |
0 |
no JS— | ||
| 2026-07-17 04:11:54.030 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— | ||
| 2026-07-17 04:05:16.671 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-17 03:42:31.166 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36 |
0 |
no JS— | ||
| 2026-07-17 03:35:18.728 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-17 03:22:30.790 UTC | blogspider/v0.1.8-4-gee7916e (+mailto:blogspideradmin@gmail.com) |
0 |
no JS— | ||
| 2026-07-17 03:05:18.038 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-17 02:55:09.687 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— | ||
| 2026-07-17 02:35:18.344 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-17 02:28:04.295 UTC | 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 |
0 |
no JS— | ||
| 2026-07-17 02:18:06.616 UTC | Mozilla/5.0 (compatible; EngagemiiBot/1.0) |
0 |
no JS— | ||
| 2026-07-17 02:05:18.347 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-17 01:35:17.272 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-17 01:16:57.701 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— | ||
| 2026-07-17 01:13:25.577 UTC | 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 |
18 |
JS ranCSSimgfontcss-bgcss-fontfaviconmanifestpreloadprefetchiframe-img@importCSP reportreport-api | ||
| 2026-07-17 01:05:16.380 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-17 00:51:50.515 UTC | Mozilla/5.0 (Linux; Android 16; MAA-AN10 Build/HONORMAA-AN10;) 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/0 bdh_ds/0 bdapp/1.0 (bdhonorbrowser; bdhonorbrowser) bdhonorbrowser/8.1.2.22 (P1 16) NABar/1.0 |
3 |
no JSCSSJSmodule | ||
| 2026-07-17 00:35:18.224 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-17 00:05:19.663 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-16 23:58:43.708 UTC | Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-07-16 23:50:21.301 UTC | uk-nhs-data/0.0 (internal fraud-research) |
0 |
no JS— | ||
| 2026-07-16 23:43:40.887 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 | ||
| 2026-07-16 23:35:18.017 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-16 23:19:18.009 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36 OPR/133.0.0.0 |
18 |
JS ranCSSJSmodulefontcss-bgcss-fontfaviconmanifestmf-iconiframe-img@importCSP reportreport-api | ||
| 2026-07-16 23:05:19.285 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-16 22:35:17.156 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-16 22:05:19.045 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-16 21:59:00.839 UTC | Twitterbot/1.0 |
3 |
no JSog-imgtwitter-img | ||
| 2026-07-16 21:44:56.749 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.6312.122 Safari/537.36 |
0 |
no JS— | ||
| 2026-07-16 21:40:00.185 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:126.0) Gecko/20100101 Firefox/126.0 |
0 |
no JS— | ||
| 2026-07-16 21:36:44.344 UTC | Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0 |
0 |
no JS— | ||
| 2026-07-16 21:35:19.349 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-16 21:20:14.452 UTC | Python/3.12 aiohttp/3.14.1 |
0 |
no JS— | ||
| 2026-07-16 21:09:51.615 UTC | Mozilla/5.0 (compatible; AffsignalCrawler/1.0; +https://affsignal.com/bot) |
0 |
no JS— | ||
| 2026-07-16 21:05:17.612 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-16 20:56:28.305 UTC | blogspider/v0.1.8 (+mailto:blogspideradmin@gmail.com) |
0 |
no JS— | ||
| 2026-07-16 20:50:24.816 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 | ||
| 2026-07-16 20:35:17.652 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-07-16 20:19:05.460 UTC | Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07) |
0 |
no JS— | ||
| 2026-07-16 20:13:27.929 UTC | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.6167.57 Safari/537.36 |
0 |
no JS— | ||
