TCP SYN (p0f)

4:42+22:0:1412:65535,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-19 17:54 · last seen 2026-10-30 02:50 · JSON

Last 7 days (8 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 TTL42+22
Options length0
MSS1412
Window size65535
Window scale10
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_58ed7828516f24
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.7
t13d1515h1_8daaf6152771_0a20fe35d3a57
t13d1515h1_8daaf6152771_de4a06bb82e36
t13d1516h1_8daaf6152771_1a63afa7c4784

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.24
ge11nn13enus_9db22d02e17a_000000000000_00000000000011
ge11nn14enus_4a2973d235de_000000000000_0000000000006
ge11nr19dede_4e9b73ab7510_000000000000_0000000000001
ge11nr18dede_45ed06ef2081_000000000000_0000000000001
ge11nr19zhtw_4e9b73ab7510_000000000000_0000000000001
ge11nr18frfr_45ed06ef2081_000000000000_0000000000001
ge11nr18zhtw_45ed06ef2081_000000000000_0000000000001
ge11nr16enus_4723467df157_000000000000_0000000000001
ge11nr17engb_021c223ca66c_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1412_1048

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.364
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.362
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/121.0.0.02
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 (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 (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/110.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.151

Country

fingerprintco-occurrences
ZA · South Africa19
KE · Kenya15
PK · Pakistan7
AE · United Arab Emirates3
QA · Qatar1
EG · Egypt1
OM · Oman1
CG · Congo - Brazzaville1

Network (ASN)

fingerprintco-occurrences
AS33771 · Safaricom Limited13
AS20011 · Dimension Data6
AS37611 · AFRIHOST SP (PTY) LTD5
AS9541 · Cyber Internet Services (Pvt) Ltd.4
AS15802 · Emirates Integrated Telecommunications Company PJSC3
AS37049 · SADV (Pty) Ltd3
AS11845 · Vox Telecom Ltd3
AS8452 · TE-AS1
AS50010 · Omani Qatari Telecommunication Company SAOC1
AS131471 · Login.Me (Pvt) 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.7
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.1