TCP SYN (JA4T)

64240_2-4-8-1-3_1460_5

first seen 2026-07-01 15:02 · last seen 2026-10-23 22:24 · JSON

Distinct clients per day (last 30 days, peak 3/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 window64240
Option kinds2-4-8-1-3
MSS1460
Window scale5

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
t13d3013h2_1d37bd780c83_8537cf56674e Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.3
t13i170900_5b57614c22b0_78e6aca7449b2
t13d4312h1_c7886603b240_b26ce05bbdd62
t13d5311h1_ed6c8d7875f9_518fb456ca591
t13d1810h2_228bd4bf6806_cf80c7f419ad1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_0000000000003
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.2
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn07*000_fd87022947da_000000000000_0000000000001
ge11nn070000_1ed44a9e06df_000000000000_0000000000001
ge11nn050000_ad924a24daef_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.4

TCP SYN (p0f)

fingerprintco-occurrences
4:48+16:0:1460:mss*44,5:mss,sok,ts,nop,ws:df,id+:03
4:44+20:0:1460:mss*44,5:mss,sok,ts,nop,ws:df,id+:02
4:107+21:0:1460:mss*44,5:mss,sok,ts,nop,ws:df,id+:01
4:49+15:0:1460:mss*44,5:mss,sok,ts,nop,ws:df,id+:01
4:52+12:0:1460:mss*44,5:mss,sok,ts,nop,ws:df,id+:01
4:42+22:0:1460:mss*44,5:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
curl/8.14.13
libredtail-http2
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.361
curl/8.12.11
TechFeedBot/1.0 (Lambda; content-aggregator)1

Country

fingerprintco-occurrences
KR · South Korea2
FR · France2
CH · Switzerland1
ID · Indonesia1
RU · Russia1
IN · India1
EC · Ecuador1

Network (ASN)

fingerprintco-occurrences
AS17858 · LG POWERCOMM2
AS16509 · Amazon.com, Inc.1
AS3215 · Orange S.A.1
AS12322 · Free SAS1
AS8402 · PJSC "Vimpelcom"1
AS27947 · Telconet S.A1
AS56803 · Datasource AG1
AS45305 · Lintas Data Prima, PT1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.3
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.2