TCP SYN (p0f)

4:40+24:0:1400:65535,8:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-25 16:40 · last seen 2026-10-28 05:23 · JSON

Last 7 days (3 observations)

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

IP version4
Initial TTL40+24
Options length0
MSS1400
Window size65535
Window scale8
Options layoutmss,sok,ts,nop,ws
Quirksdf,id+
Payload class0

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
t13d4412h1_fd39b124ee10_58ed7828516f7
t13d1515h1_8daaf6152771_0a20fe35d3a55
t13d1515h1_8daaf6152771_de4a06bb82e35
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

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.7
ge11nn13enus_9db22d02e17a_000000000000_0000000000006
ge11nn14enus_4a2973d235de_000000000000_0000000000004
ge11nr18dede_45ed06ef2081_000000000000_0000000000001
ge11nr19zhtw_4e9b73ab7510_000000000000_0000000000001
ge11nr18enus_45ed06ef2081_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1400_820

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.362
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/131.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4886.148 Safari/537.361

Country

fingerprintco-occurrences
PK · Pakistan4
AE · United Arab Emirates3
IR · Iran2
ZA · South Africa2
BD · Bangladesh2
BR · Brazil1
KE · Kenya1
KW · Kuwait1
NG · Nigeria1
JO · Jordan1

Network (ASN)

fingerprintco-occurrences
AS5384 · Emirates Internet3
AS9541 · Cyber Internet Services (Pvt) Ltd.3
AS44244 · Iran Cell Service and Communication Company2
AS24432 · TM International Bangladesh Ltd.Internet service Provider,Gulshan-1,Dhaka-12122
AS48832 · Jordanian mobile phone services Ltd1
AS12091 · MTN SA1
AS59257 · CMPak Limited1
AS36926 · Airtel Networks Kenya Limited1
AS29465 · MTN NIGERIA Communication limited1
AS29357 · NATIONAL MOBILE TELECOMMUNICATIONS COMPANY K.S.C.P.1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 157.0.1, firefox-esr 153.5.1esr, firefox 158.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.3