TCP SYN (p0f)

4:43+21:0:1440:65535,8:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-19 17:01 · last seen 2026-10-30 02:43 · JSON

Last 7 days (14 observations)

Distinct clients per day (last 30 days, peak 7/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 TTL43+21
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
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.13
t13d4412h1_fd39b124ee10_58ed7828516f13
t13d1515h1_8daaf6152771_de4a06bb82e38
t13d1515h1_8daaf6152771_0a20fe35d3a54
t13d1517h2_8daaf6152771_b1ff8ab2d16f1

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.13
ge11nn13enus_9db22d02e17a_000000000000_00000000000010
ge11nr19frfr_4e9b73ab7510_000000000000_0000000000003
ge11nn14enus_4a2973d235de_000000000000_0000000000002
ge11nr19zhtw_4e9b73ab7510_000000000000_0000000000002
ge11nr18zhtw_45ed06ef2081_000000000000_0000000000002
ge11nr16frfr_3dfdba18536b_000000000000_0000000000002
ge20nr13enus_e2ac93ffb364_000000000000_0000000000001
ge11nr19dede_4e9b73ab7510_000000000000_0000000000001
ge11nr16zhtw_4723467df157_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.1

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1440_839

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/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36 Edg/121.0.0.02
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/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/120.0.0.0 Safari/537.36 Edg/120.0.0.01
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.01
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

Country

fingerprintco-occurrences
BR · Brazil10
ZA · South Africa10
BD · Bangladesh9
PK · Pakistan4
UZ · Uzbekistan2
ID · Indonesia1
RU · Russia1
KE · Kenya1
BA · Bosnia & Herzegovina1

Network (ASN)

fingerprintco-occurrences
AS328471 · HERO TELECOMS (PTY) LTD4
AS9541 · Cyber Internet Services (Pvt) Ltd.3
AS26599 · TELEFÔNICA BRASIL S.A3
AS23688 · Link3 Technologies Ltd.3
AS27699 · TELEFÔNICA BRASIL S.A2
AS8193 · "Uzbektelekom" Joint Stock Company2
AS11845 · Vox Telecom Ltd2
AS134480 · Sunlit Network2
AS20011 · Dimension Data1
AS137568 · SKY SYSTEMS LTD1

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.13
0a0a,001d,0017,00182