ua-tracer
by Paul Kinlan
ua-tracer
what does a user agent actually fetch, follow & run?
This page just minted a fresh trace id bCSF4mr5. Every asset it references
lives under /r/bCSF4mr5/iLNG8PoV/…, 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 "FrostedHarvesterBot/7.0" 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 28202 homepage requests, grouped by user agent. Click one to filter the list below.
| User Agent | Requests | JS ran |
|---|---|---|
facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
9993 | 0 |
(no user-agent) |
5549 | 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 |
1315 | 1 |
Wget/1.25.0 |
560 | 0 |
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot |
481 | 0 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 |
203 | 2 |
Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/) |
181 | 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 |
132 | 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 |
114 | 1 |
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 |
111 | 0 |
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 |
104 | 1 |
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 |
104 | 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 |
103 | 2 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 |
97 | 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 |
Feedbox/1.0 (+https://github.com/feedbox) |
93 | 0 |
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36 |
92 | 7 |
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 |
87 | 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 |
85 | 28 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 |
74 | 2 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 |
74 | 0 |
Hello from Palo Alto Networks, find out more about our scans in https://docs-cortex.paloaltonetworks.com/r/1/Cortex-Xpanse/Scanning-activity |
72 | 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 |
62 | 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 |
61 | 0 |
View all 2442 user agents (paged) →
Recent homepage requests
Newest first. Each row is a single load of / by some user agent.
| Timestamp | User Agent | Assets |
|---|---|---|
| 2026-11-09 14:23:15.713 UTC | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com) |
0 |
no JS✓ ClaudeBot— | ||
| 2026-11-09 14:20:18.169 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— | ||
| 2026-11-09 14:04:28.982 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 14:04:18.547 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-11-09 14:02:54.549 UTC | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/27.0 Safari/605.1.15 |
27 |
JS ranCSSJSmodulefontcss-fontfaviconmanifestpreloadiframeiframe-img@importreport-api | ||
| 2026-11-09 14:01:18.601 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 13:58:01.054 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 13:54:45.309 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 13:53:35.177 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 13:51:09.379 UTC | Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/) |
0 |
no JS— | ||
| 2026-11-09 13:48:01.513 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 13:44:45.229 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 13:41:20.511 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 13:38:50.983 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 13:37:50.651 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 13:34:18.789 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-11-09 13:33:30.000 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 13:30:57.387 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 13:04:19.251 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-11-09 13:02:58.042 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:59:52.337 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:56:45.268 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:53:36.257 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:52:22.627 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:47:10.312 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:44:02.644 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:40:50.813 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:38:34.797 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:37:34.761 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:37:28.627 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0 Safari/537.36 |
0 |
no JS— | ||
| 2026-11-09 12:35:49.482 UTC | ProbeTest <img src=x onerror=alert(1)> <script>alert(2)</script> |
0 |
no JS— | ||
| 2026-11-09 12:34:54.678 UTC | Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) |
0 |
no JS⚠ fake Googlebot?— | ||
| 2026-11-09 12:34:20.482 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-11-09 12:33:26.217 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:31:07.520 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:30:51.629 UTC | curl/8.5.0 |
0 |
no JS— | ||
| 2026-11-09 12:14:10.870 UTC | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36 Edg/99.0.1150.30 |
0 |
no JS— | ||
| 2026-11-09 12:06:26.927 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 12:04:21.583 UTC | (no user-agent) |
0 |
no JS— | ||
| 2026-11-09 12:02:57.020 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 11:59:17.098 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 11:55:49.988 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 11:52:51.327 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 11:48:33.802 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 11:45:06.289 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 11:41:33.705 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 11:38:57.422 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 11:37:58.527 UTC | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
0 |
no JS— | ||
| 2026-11-09 11:35:09.814 UTC | LearningMachineResearchPilot/0.1 (+https://learningmachine.ai/; HN link availability research) |
0 |
no JS— | ||
| 2026-11-09 11:34:20.221 UTC | (no user-agent) |
0 |
no JS— | ||
