TCP SYN (p0f)

4:45+19:0:1440:65535,8:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-26 15:26 · last seen 2026-10-28 14:39 · JSON

Last 7 days (21 observations)

Distinct clients per day (last 30 days, peak 14/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 TTL45+19
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_58ed7828516f30
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.21
t13d1515h1_8daaf6152771_de4a06bb82e319
t13d1515h1_8daaf6152771_0a20fe35d3a515
t13d1516h1_8daaf6152771_d8a2da3f94cd1
t13d1516h1_8daaf6152771_1a63afa7c4781

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.30
ge11nn13enus_9db22d02e17a_000000000000_00000000000026
ge11nn14enus_4a2973d235de_000000000000_0000000000009
ge11nr17enus_021c223ca66c_000000000000_0000000000003
ge11nr19frfr_4e9b73ab7510_000000000000_0000000000002
ge11nr19zhcn_4e9b73ab7510_000000000000_0000000000002
ge11nr17frfr_021c223ca66c_000000000000_0000000000002
ge11nr17dede_021c223ca66c_000000000000_0000000000002
ge11nr14enus_720e99a7fa86_000000000000_0000000000001
ge11nr19engb_b6b229695b27_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1440_886

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.366
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.365
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.364
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.364
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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.362
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/120.0.0.02
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Safari/605.1.152
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

Country

fingerprintco-occurrences
BD · Bangladesh36
BR · Brazil21
ZA · South Africa10
UA · Ukraine3
PK · Pakistan3
US · United States2
VE · Venezuela2
AU · Australia1
RU · Russia1
AR · Argentina1

Network (ASN)

fingerprintco-occurrences
AS11845 · Vox Telecom Ltd4
AS27699 · TELEFÔNICA BRASIL S.A2
AS18881 · TELEFÔNICA BRASIL S.A2
AS58689 · ICC Communication2
AS136429 · BAS Network2
AS134732 · Dot Internet2
AS327901 · Level 7 Wireless (Pty) Ltd2
AS8075 · Microsoft Corporation1
AS7545 · TPG Telecom Limited1
AS5384 · Emirates Internet1

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.21
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1