Ua-tracer: what does a user agent fetch, follow and run

ua-tracer

This page just minted a fresh trace id WPxVgFcs. Every asset it references lives under /r/WPxVgFcs/SfDOvRiH/…, 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 "QuietHarvesterBot/4.3" 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 1497 homepage requests, grouped by user agent. Click one to filter the list below.

User AgentRequestsJS ran

Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/6… 86

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KH… 78 72

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, l… 55

curl/8.20.0 43

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KH… 32

Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gec… 31 26

Go-http-client/1.1 30

facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.p… 26

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, l… 22

Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gec… 17 15

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko)… 15 10

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko)… 15 15

okhttp/5.3.0 15

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11) AppleWebKit/601.1.27 (KH… 14

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko)… 14 10

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGP… 14

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, l… 12

TLM-Audit-Scanner/1.0 12

Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605… 11

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, l… 11

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KH… 10

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, l…

TelegramBot (like TwitterBot)

View all 618 user agents (paged) →

Recent homepage requests

Newest first. Each row is a single load of / by some user agent.

Filter

TimestampUser AgentAssets

2026-07-03 04:10:07.140 UTC HackerNewsAggregator/1.0 Mozilla/5.0 (compatible; HackerNewsAggregator/1.0)

no JS—

2026-07-03 04:10:05.410 UTC NovaBot/1.0 Mozilla/5.0 (compatible; NovaBot/1.0)

no JS—

2026-07-03 04:10:03.924 UTC Firefox/121.0 Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0

no JS—

2026-07-03 04:10:03.900 UTC Explorer/2.2 Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) News Explorer/2.2

no JSog-img

2026-07-03 04:10:02.691 UTC ESDS-LeadGen/0.1 Mozilla/5.0 (compatible; ESDS-LeadGen/0.1; +https://www.esds.co.in)

no JS—

2026-07-03 04:10:02.150 UTC Chrome/136.0.0.0 Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

no JSapple-iconog-img

2026-07-03 04:10:01.986 UTC Chrome/136.0.0.0 Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

no JSapple-iconog-img

2026-07-03 04:09:49.309 UTC Discordbot/2.0 Mozilla/5.0 (compatible; Discordbot/2.0; +https://discordapp.com)

no JStwitter-img

2026-07-03 04:09:48.939 UTC Discordbot/2.0 Mozilla/5.0 (compatible; Discordbot/2.0; +https://discordapp.com)

no JSog-img

2026-07-03 04:09:48.182 UTC python-requests/2.28.2 python-requests/2.28.2

no JS—

2026-07-03 04:08:43.305 UTC SoftNews/0.1 SoftNews/0.1 (+https://github.com/softnews)

no JS—

2026-07-03 04:08:38.151 UTC Darwin/25.5.0 WidgetExtension/1 CFNetwork/3860.600.12 Darwin/25.5.0

no JSog-img

2026-07-03 04:08:16.151 UTC TelegramBot TelegramBot (like TwitterBot)

no JStwitter-img

2026-07-03 04:08:08.334 UTC python-httpx/0.28.1 python-httpx/0.28.1

no JS—

2026-07-03 04:08:04.622 UTC pytheum/0.1 pytheum/0.1 (+https://pytheum.com)

no JS—

2026-07-03 04:08:02.874 UTC python-httpx/0.28.1 python-httpx/0.28.1

no JS—

2026-07-03 04:08:01.302 UTC Bytespider Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)

no JSCSSimgcss-bgpreloadiframeiframe-img@import

2026-07-03 04:07:36.346 UTC HeadlessChrome/134.0.6998.35 Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/134.0.6998.35 Safari/537.36

JS ranCSSmoduleimgfontcss-bgcss-fontprefetchiframeiframe-img@importCSP reportreport-api

2026-07-03...

Ua-tracer: what does a user agent fetch, follow and run

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