User-Agent

Mozilla/5.0 (X11; Linux x86_64; rv:147.0) Gecko/20100101 Firefox/147.0 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))

first seen 2026-07-25 20:49 · last seen 2026-09-04 16:05 · JSON

Distinct clients per day (last 30 days, peak 4/day)

Distinct clients are counted by IP-hash per complete UTC day — unlike observation counts this is insensitive to one chatty client, but NAT merges clients and address rotation splits them.

Decomposed attributes

Browser / clientmeta-externalagent 1.1
Operating systemLinux x86_64
Device classbot
Declared URLhttps://developers.facebook.com/docs/sharing/webmasters/crawler
Noteinferred from the self-declared string — a claim, not a measurement; compare with the wire fingerprints above

Co-observed signals

Signals from other families seen in the same observation. A fingerprint spread thinly across many lower-layer signatures is a classic inconsistency signal.

TLS ClientHello (JA4)

fingerprintco-occurrences
t13d3111h2_e8f1e7e78f70_5ac7197df9d242

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_80b089f68b8e_000000000000_00000000000017
ge20nn020000_e5a56608905c_000000000000_00000000000013
ge20nn09enus_c5abe4666a67_000000000000_0000000000007
ge20nn070000_1903711a2262_000000000000_0000000000005

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:4096;2:0;5:16384;6:131072;3:100;4:65536|26148865|0|m,s,p,a31
1:4096;2:0;5:16384;6:131072;3:100;4:65536;11105:65535;11106:65535;11107:65535;11108:10;11109:10|26148865|0|m,s,p,a11

TCP SYN (p0f)

fingerprintco-occurrences
6:56+8:0:1380:65535,8:mss,sok,ts,nop,ws::036
6:58+6:0:1380:65535,8:mss,sok,ts,nop,ws::04
6:247+8:0:1380:65535,8:mss,sok,ts,nop,ws::01
4:83+?:0:1380:65535,8:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1380_842

Country

fingerprintco-occurrences
US · United States42

Network (ASN)

fingerprintco-occurrences
AS32934 · Facebook, Inc.42