TCP SYN (p0f)

4:49+15:0:1400:mss*20,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-01 12:10 · last seen 2026-10-28 11:10 · JSON

Last 7 days (24 observations)

Distinct clients per day (last 30 days, peak 18/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 TTL49+15
Options length0
MSS1400
Window sizemss*20
Window scale7
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
t13d4312h1_c7886603b240_b26ce05bbdd693
t13d491000_834380eab35e_5ac7197df9d211
t13d190900_9dc949149365_97f8aa674fd91
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +28 more.The fingerprint page shows the full measured match list. More on the catalog.1

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.94
ge11nn050000_0b4164a3b800_000000000000_0000000000002
ge11nn050000_1b4a3c75e91c_000000000000_0000000000002
ge11nn050000_909c614022eb_000000000000_0000000000002
ge11nn050000_3658ef221638_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.21.4, wget 1.25.0, wget 1.21.3.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn050000_c727097c2f59_000000000000_0000000000001
ge11nn060000_04b3596173ac_000000000000_0000000000001
ge11nn050000_917e31bfc6bb_000000000000_0000000000001
ge20nr09cnr0_6dc8a3800e93_000000000000_0000000000001
ge11nn050000_b5720f320511_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,s,a,p1

TCP SYN (JA4T)

fingerprintco-occurrences
29200_2-4-8-1-3_1400_7106

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/120.0.0.093
Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.12
Mozilla/5.051975669 Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.362
Mozilla/5.0 (Linux; U; Android 4.3; en-us; SM-N900T Build/JSS15J) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.302
Go-http-client/1.11
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.2 Safari/605.1.151
Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Mobile Safari/537.361
Mozilla/5.0 (iPad; CPU OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.11
Mozilla/5.082584686 Mozilla/5.0 (iPhone; CPU iPhone OS 11_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/11.0 Mobile/15E148 Safari/604.11
Mozilla/5.067805899 Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.361

Country

fingerprintco-occurrences
CN · China105
ME · Montenegro1

Network (ASN)

fingerprintco-occurrences
AS4837 · CHINA UNICOM China169 Backbone57
AS4134 · CHINANET BACKBONE29
AS17638 · ASN for TIANJIN Provincial Net of CT8
AS17622 · China Unicom Guangzhou network3
AS17621 · China Unicom Shanghai network3
AS140061 · Qinghai Telecom3
AS137266 · CHINATELECOM Hubei province Wuhan 5G network1
AS8585 · Crnogorski Telekom a.d.Podgorica1
AS140726 · UNICOM AnHui province network1

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,001842