TCP SYN (p0f)

4:39+25:0:1440:65535,8:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-26 07:37 · last seen 2026-10-28 06:28 · JSON

Last 7 days (5 observations)

Distinct clients per day (last 30 days, peak 4/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 TTL39+25
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.5
t13d1515h1_8daaf6152771_0a20fe35d3a53
t13d1515h1_8daaf6152771_de4a06bb82e33
t13d4412h1_fd39b124ee10_58ed7828516f3

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.3
ge11nn13enus_9db22d02e17a_000000000000_0000000000003
ge11nn14enus_4a2973d235de_000000000000_0000000000003
ge11nr19zhcn_4e9b73ab7510_000000000000_0000000000002
ge11nr15dede_944d72baa157_000000000000_0000000000001
ge11nr19dede_4e9b73ab7510_000000000000_0000000000001
ge11nr15engb_944d72baa157_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1440_814

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.363
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/131.0.0.0 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64; rv:127.0) Gecko/20100101 Firefox/127.01
Mozilla/5.0 (Macintosh; Intel Mac OS X 11_1_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36 FS1
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.41 Safari/537.361
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.45 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36 Edg/121.0.0.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.6312.122 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.6613.85 Safari/537.361

Country

fingerprintco-occurrences
BR · Brazil5
ZA · South Africa3
PK · Pakistan3
PE · Peru1
EG · Egypt1
IQ · Iraq1

Network (ASN)

fingerprintco-occurrences
AS9541 · Cyber Internet Services (Pvt) Ltd.3
AS14593 · Space Exploration Technologies Corporation1
AS8452 · TE-AS1
AS11845 · Vox Telecom Ltd1
AS262773 · PROXXIMA TELECOMUNICACOES SA1
AS266636 · REDE WORKS TELECOM1
AS197893 · Elsuhd Company for Communications Services, Cybersecurity, Information Technology, Electronic Governance, and Commercial Agencies, Ltd.1
AS328622 · MHYAS HOLDINGS (PTY) LTD1
AS267078 · CUIABA FIBRA INTERNET EIRELI1
AS329303 · Splizr Networks (Pty) 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.5