TCP SYN (JA4T)

65535_2-4-8-1-3_1400_10

first seen 2026-07-02 03:59 · last seen 2026-09-15 05:16 · JSON

Last 7 days (4 observations)

Distinct clients per day (last 30 days, peak 23/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
MSS1400
Window scale10

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_58ed7828516f153
t13d1515h1_8daaf6152771_de4a06bb82e362
t13d1515h1_8daaf6152771_0a20fe35d3a553
t13d1516h1_8daaf6152771_1a63afa7c4785
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +24 more.The fingerprint page shows the full measured match list. More on the catalog.2
t13d1513h2_8daaf6152771_eca864cca44a1
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d6815h2_13e0e9e1c501_9fa07b4a9e5e1

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.153
ge11nn13enus_9db22d02e17a_000000000000_00000000000084
ge11nn14enus_4a2973d235de_000000000000_00000000000036
ge20nr12enus_54b4638ab28b_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, edge 151.0.4129.93, +36 more.The fingerprint page shows the full measured match list. More on the catalog.2
ge20nn020000_b89ce445e0b3_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.27.0, go-net/http 1.26.6, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge20nn15enus_28e542058e45_000000000000_0000000000001
ge20nr13ptbr_99f5f7e883ca_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog.2
4:16777216|16711681|0|m,p,a,s1
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +43 more.The fingerprint page shows the full measured match list. More on the catalog.1
2:0;3:100;6:32768|10485760|0|a,m,p,s1

TCP SYN (p0f)

fingerprintco-occurrences
4:45+19:0:1400:65535,10:mss,sok,ts,nop,ws:df,id+:031
4:46+18:0:1400:65535,10:mss,sok,ts,nop,ws:df,id+:031
4:44+20:0:1400:65535,10:mss,sok,ts,nop,ws:df,id+:029
4:47+17:0:1400:65535,10:mss,sok,ts,nop,ws:df,id+:023
4:43+21:0:1400:65535,10:mss,sok,ts,nop,ws:df,id+:019
4:42+22:0:1400:65535,10:mss,sok,ts,nop,ws:df,id+:018
4:51+13:0:1400:65535,10:mss,sok,ts,nop,ws:df,id+:015
4:49+15:0:1400:65535,10:mss,sok,ts,nop,ws:df,id+:014
4:48+16:0:1400:65535,10:mss,sok,ts,nop,ws:df,id+:014
4:41+23:0:1400:65535,10:mss,sok,ts,nop,ws:df,id+:013

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.3617
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.3611
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.3611
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.3610
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.3610
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.368
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.368
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.368
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.368
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.367

Country

fingerprintco-occurrences
ZA · South Africa84
KE · Kenya41
NG · Nigeria30
ET · Ethiopia24
BD · Bangladesh19
PK · Pakistan15
QA · Qatar12
BH · Bahrain6
AE · United Arab Emirates5
DZ · Algeria5

Network (ASN)

fingerprintco-occurrences
AS37105 · RAIN GROUP HOLDINGS (PTY) LTD41
AS12091 · MTN SA38
AS33771 · Safaricom Limited30
AS24757 · Ethio Telecom24
AS36873 · Airtel Networks Limited17
AS8781 · Ooredoo Q.S.C.12
AS29465 · MTN NIGERIA Communication limited11
AS24432 · TM International Bangladesh Ltd.Internet service Provider,Gulshan-1,Dhaka-121211
AS45669 · PMCL /LDI IP TRANSIT8
AS5384 · Emirates Internet5

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprintlinked observations
q13d0311h3_55b375c5d22e_653d80c3fe9d2