TCP SYN (p0f)

4:44+20:0:1440:65535,8:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-21 04:21 · last seen 2026-10-28 13:44 · JSON

Last 7 days (15 observations)

Distinct clients per day (last 30 days, peak 10/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 TTL44+20
Options length0
MSS1440
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_58ed7828516f17
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.15
t13d1515h1_8daaf6152771_de4a06bb82e310
t13d1515h1_8daaf6152771_0a20fe35d3a57

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.17
ge11nn13enus_9db22d02e17a_000000000000_00000000000013
ge11nn14enus_4a2973d235de_000000000000_0000000000004
ge11nr19dede_4e9b73ab7510_000000000000_0000000000003
ge11nr17zhtw_021c223ca66c_000000000000_0000000000002
ge11nr19engb_4e9b73ab7510_000000000000_0000000000002
ge11nr19frfr_4e9b73ab7510_000000000000_0000000000001
ge11nr18zhcn_45ed06ef2081_000000000000_0000000000001
ge11nr16dede_3dfdba18536b_000000000000_0000000000001
ge11nr18engb_45ed06ef2081_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1440_849

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.365
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.152
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 Edg/122.0.0.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.361

Country

fingerprintco-occurrences
BR · Brazil22
BD · Bangladesh13
ZA · South Africa5
DO · Dominican Republic2
RO · Romania1
MX · Mexico1
VN · Vietnam1
PE · Peru1
CO · Colombia1
PK · Pakistan1

Network (ASN)

fingerprintco-occurrences
AS26599 · TELEFÔNICA BRASIL S.A5
AS11845 · Vox Telecom Ltd4
AS18881 · TELEFÔNICA BRASIL S.A2
AS267484 · CABONNET INTERNET LTDA2
AS14593 · Space Exploration Technologies Corporation1
AS8708 · DIGI ROMANIA S.A.1
AS45899 · VNPT Corp1
AS27699 · TELEFÔNICA BRASIL S.A1
AS9541 · Cyber Internet Services (Pvt) Ltd.1
AS58689 · ICC Communication1

TLS supported groups

fingerprintco-occurrences
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.15