TCP SYN (JA4T)

42300_2-4-8-1-3_1410_12

first seen 2026-07-01 14:56 · last seen 2026-10-31 02:25 · JSON

Last 7 days (29 observations)

Distinct clients per day (last 30 days, peak 15/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 window42300
Option kinds2-4-8-1-3
MSS1410
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
t13d311200_1d947a95fc68_7e1102d2036b Match?Exact match in Thumbprint's published controlled catalog captures: java-urlconnection 17.0.19.The fingerprint page shows the full measured match list. More on the catalog.29
t13d5911h1_a33745022dd6_1f22a2ca17c4 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 23.11.1.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_487c3246ac94_000000000000_00000000000029
he11nn07*000_fd87022947da_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:52+12:0:1410:mss*30,12:mss,sok,ts,nop,ws:df,id+:029
4:48+16:0:1410:mss*30,12:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; KakaoBot/1.0; +https://cs.kakao.com/helps_html/1073213012)29
LivelapBot/0.2 (http://site.livelap.com/crawler)1

Country

fingerprintco-occurrences
KR · South Korea29
NL · Netherlands1

Network (ASN)

fingerprintco-occurrences
AS152199 · Kakao Corp11
AS7625 · Kakao Corp9
AS18160 · Kakao Corp9
AS1136 · KPN B.V.1

TLS supported groups

fingerprintco-occurrences
001d,0017,0018,0019,001e,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: java-httpclient 17.0.19, java-httpclient 11.0.31.The fingerprint page shows the full measured match list. More on the catalog.29