TCP SYN (JA4T)

8192_2-1-3-1-1-4_1420_2

first seen 2026-08-29 08:58 · last seen 2026-10-23 22:06 · JSON

Distinct clients per day (last 30 days, peak 1/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

TCP window8192
Option kinds2-1-3-1-1-4
MSS1420
Window scale2

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
t13d2913h1_723694b0fccc_5671b5df50295
t13d3013h2_1d37bd780c83_8537cf56674e1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_0000000000001
ge11nr11frfr_835281d8e5d9_000000000000_0000000000001
ge11nr11frfr_b350a6a7c155_000000000000_0000000000001
ge11nr11jajp_835281d8e5d9_000000000000_0000000000001
ge11nr11nlbe_b350a6a7c155_000000000000_0000000000001
ge11nr11nlbe_835281d8e5d9_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:112+16:0:1420:8192,2:mss,nop,ws,nop,nop,sok:df,id+:03
4:48+16:0:1420:8192,2:mss,nop,ws,nop,nop,sok:df,id+:02
4:115+13:0:1420:8192,2:mss,nop,ws,nop,nop,sok:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (iPhone; CPU iPhone OS 18_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1 Mobile/15E148 Safari/604.12
Mozilla/5.0 (iPhone; CPU iPhone OS 17_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Mobile/15E148 Safari/604.12
curl/8.14.11
Mozilla/5.0 (iPhone; CPU iPhone OS 17_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1 Mobile/15E148 Safari/604.11

Country

fingerprintco-occurrences
JP · Japan2
BE · Belgium2
FR · France2

Network (ASN)

fingerprintco-occurrences
AS6848 · Telenet BV2
AS13193 · Keyyo SA2
AS4713 · NTT DOCOMO BUSINESS,Inc.1
AS17676 · SoftBank Corp.1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.1