ua-tracer
by Paul Kinlan
ua-tracer
what does a user agent actually fetch, follow & run?
This page just minted a fresh trace id oioVfKDa. Every asset it references
lives under /r/oioVfKDa/9MaqIikg/…, 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 "CrimsonCometBot/9.7" 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 19258 homepage requests, grouped by user agent. Click one to filter the list below.
| User Agent | Requests | JS ran |
|---|---|---|
(no user-agent) |
4649 | 0 |
facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
3672 | 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 |
1185 | 1 |
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot |
424 | 0 |
Wget/1.25.0 |
363 | 0 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 |
188 | 2 |
Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/) |
148 | 0 |
Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots) |
138 | 0 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36 |
126 | 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 Edg/120.0.0.0 |
106 | 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 |
101 | 1 |
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 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.36 |
94 | 0 |
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 |
91 | 2 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 |
80 | 1 |
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36 |
75 | 7 |
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 |
72 | 28 |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36 |
66 | 1 |
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 |
65 | 0 |
Hello from Palo Alto Networks, find out more about our scans in https://docs-cortex.paloaltonetworks.com/r/1/Cortex-Xpanse/Scanning-activity |
60 | 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 |
58 | 0 |
curl/8.20.0 |
57 | 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 |
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 |
View all 2268 user agents (paged) →
Recent homepage requests
Newest first. Each row is a single load of / by some user agent.
| Timestamp | User Agent | Assets |
|---|---|---|
| 2026-10-20 02:11:51.443 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— | ||
| 2026-10-20 02:08:34.531 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-10-20 02:04:12.834 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-10-20 02:03:15.486 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 02:00:21.513 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 01:57:34.677 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 |
8 |
no JSCSSJSmodulefontcss-fontprefetchiframe@import | ||
| 2026-10-20 01:57:22.153 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 01:54:24.418 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 01:51:29.765 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 01:48:31.702 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 01:45:36.765 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 01:42:36.378 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 01:39:36.330 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 01:36:52.788 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 01:35:09.973 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 01:34:16.319 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-10-20 01:32:57.092 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 01:32:28.004 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— | ||
| 2026-10-20 01:30:42.982 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 01:24:50.938 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-10-20 01:04:12.511 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-10-20 01:00:40.553 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:57:55.589 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:55:19.231 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-10-20 00:55:10.547 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:52:24.762 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:49:41.848 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:46:55.510 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:44:13.691 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:41:27.583 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:39:05.102 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:36:36.256 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:34:40.244 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:34:13.048 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-10-20 00:32:54.278 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:30:43.139 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-20 00:20:10.389 UTC | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-10-20 00:16:50.688 UTC | Wget/1.25.0 |
0 |
no JS— | ||
| 2026-10-20 00:16:46.428 UTC | Wget/1.25.0 |
0 |
no JS— | ||
| 2026-10-20 00:16:43.339 UTC | Wget/1.25.0 |
0 |
no JS— | ||
| 2026-10-20 00:04:13.178 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-10-20 00:01:14.754 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-19 23:58:30.877 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-19 23:55:44.316 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-19 23:52:55.536 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-19 23:50:09.327 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-19 23:47:26.522 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-19 23:44:53.268 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-19 23:41:47.406 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-10-19 23:39:40.328 UTC | webshopok-kutatas/0.1 (+kapcsolat: test@datalistshop.eu; belso piackutatas, .com webshopok) |
0 |
no JS— | ||
