TCP SYN (p0f)

4:37+27:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-26 05:37 · last seen 2026-10-28 04:56 · JSON

Last 7 days (2 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 TTL37+27
Options length0
MSS1460
Window sizemss*44
Window scale7
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
t13i170900_5b57614c22b0_78e6aca7449b4
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.2
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.2
t13d151000_8daaf6152771_18e8a06d9b2d1
t13d1515h1_8daaf6152771_de4a06bb82e31
t13d4412h1_fd39b124ee10_58ed7828516f1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn070000_3cb602b7de70_000000000000_0000000000002
ge11nn050000_57c8ed532189_000000000000_0000000000002
ge20nn14enus_d5f0be3c97b6_000000000000_0000000000002
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.1
ge11nn040000_e1d2031bdfea_000000000000_0000000000001
ge11nn13enus_9db22d02e17a_000000000000_0000000000001
ge11nr16zhcn_3dfdba18536b_000000000000_0000000000001
ge11nr17zhcn_021c223ca66c_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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, +60 more.The fingerprint page shows the full measured match list. More on the catalog.2

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_711

User-Agent

fingerprintco-occurrences
libredtail-http4
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1 Safari/605.1.151
Mozilla/5.0 (Windows NT 6.3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.190 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:123.0) Gecko/20100101 Firefox/123.01
Mozilla/5.0 (Linux; Android 6.0.1; SM-J210F Build/MMB29Q; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/59.0.3071.125 Mobile Safari/537.361
Mozilla/5.0 (Linux; Android 4.4.4; SM-J100ML Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.95 Mobile Safari/537.361

Country

fingerprintco-occurrences
PK · Pakistan4
IR · Iran2
SG · Singapore1
BR · Brazil1
AR · Argentina1
CO · Colombia1
BO · Bolivia1

Network (ASN)

fingerprintco-occurrences
AS59257 · CMPak Limited4
AS60631 · Vandad Vira Hooman LLC2
AS50219 · Valence Technology Co.1
AS27882 · Telefónica Celular de Bolivia S.A.1
AS28126 · BRISANET SERVICOS DE TELECOMUNICACOES S.A1
AS271957 · SOMOS NETWORKS COLOMBIA S.A.S. BIC1
AS52279 · ETERNET S.R.L.1

TLS supported groups

fingerprintco-occurrences
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 156.0.8078.48, edge 155.0.4283.62, chrome 156.0.8078.47, +11 more.The fingerprint page shows the full measured match list. More on the catalog.3
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog.2