TCP SYN (JA4T)

65535_2-4-8-1-3_1460_12

first seen 2026-06-30 01:51 · last seen 2026-09-13 11:21 · JSON

Last 7 days (10 observations)

Distinct clients per day (last 30 days, peak 7/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 window65535
Option kinds2-4-8-1-3
MSS1460
Window scale12

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
t13d351300_bfa337485184_c266ffd845cb246
t13d1312h1_f57a46bbacb6_ab7e3b40a6777
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.3
t12d290700_fc2078a0b8c0_8c06664c3ac52
t13d160900_1711a4c0508c_c06d14d7e8f61
t13d2013h1_2b729b4bf6f3_e24568c0d4401

HTTP request (JA4H)

fingerprintco-occurrences
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.246
ge11nr05enus_900748f1e0f3_000000000000_0000000000006
ge11nr040000_e1d2031bdfea_000000000000_0000000000002
ge11nr030000_cd680697de12_000000000000_0000000000002
ge11nr15engb_fb9994e70428_000000000000_0000000000001
ge11nn040000_bfa5a9b89dd6_000000000000_0000000000001
ge11nn030000_dd98166e0881_000000000000_0000000000001
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:46+18:0:1460:65535,12:mss,sok,ts,nop,ws:df,id+:0195
4:44+20:0:1460:65535,12:mss,sok,ts,nop,ws:df,id+:037
4:45+19:0:1460:65535,12:mss,sok,ts,nop,ws:df,id+:015
4:55+9:0:1460:65535,12:mss,sok,ts,nop,ws:df,id+:09
4:51+13:0:1460:65535,12:mss,sok,ts,nop,ws::02
4:51+13:0:1460:65535,12:mss,sok,ts,nop,ws:df,id+:01
4:48+16:0:1460:65535,12:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; MJ12bot/v2.0.5; http://mj12bot.com/)246
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.362
Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)2
Mozilla/5.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36 Edg/149.0.0.01
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.151
Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Mobile/15E148 Safari/604.11
Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.01
curl/8.21.01

Country

fingerprintco-occurrences
FR · France246
US · United States10
DE · Germany2
AU · Australia1
CN · China1

Network (ASN)

fingerprintco-occurrences
AS16276 · OVH SAS246
AS142430 · DIGI VPS9
AS3209 · Vodafone GmbH2
AS6128 · Cablevision Systems Corp.1
AS9983 · Australian Bureau of Statistics.1
AS38365 · Beijing Baidu Netcom Science and Technology Co., Ltd.1