User-Agent

meta-webindexer/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)

first seen 2026-09-24 15:01 · last seen 2026-10-10 11:57 · JSON

Distinct clients per day (last 30 days, peak 2/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-webindexer 1.1
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
t13d1611h2_a2dbe2762f31_5ac7197df9d25

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_80b089f68b8e_000000000000_0000000000005

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:4096;2:0;5:16384;6:131072;4:1048576|10420225|0|m,s,p,a5

TCP SYN (p0f)

fingerprintco-occurrences
6:54+10:0:1360:65535,13:mss,sok,ts,nop,ws:flow:02
4:55+9:0:1460:65535,9:mss,sok,ts,nop,ws:df,id+:01
4:60+4:0:1460:65535,9:mss,sok,ts,nop,ws:df,id+:01
4:59+5:0:1460:65535,9:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1460_93
65535_2-4-8-1-3_1360_132

Country

fingerprintco-occurrences
US · United States5

Network (ASN)

fingerprintco-occurrences
AS54113 · Fastly, Inc.3
AS13335 · Cloudflare, Inc.2