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 2026-09-10 10:43 · JSON

Last 7 days (28 observations)

Distinct clients per day (last 30 days, peak 25/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_b26ce05bbdd648
t13d491000_834380eab35e_5ac7197df9d24
t13d190900_9dc949149365_97f8aa674fd91

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.49
ge11nn050000_0b4164a3b800_000000000000_0000000000002
ge11nn060000_04b3596173ac_000000000000_0000000000001
ge11nn050000_1b4a3c75e91c_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
29200_2-4-8-1-3_1400_753

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/120.0.0.048
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/601.11
Go-http-client/1.11
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/534.301
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

Country

fingerprintco-occurrences
CN · China53

Network (ASN)

fingerprintco-occurrences
AS4837 · CHINA UNICOM China169 Backbone30
AS4134 · CHINANET BACKBONE15
AS17638 · ASN for TIANJIN Provincial Net of CT3
AS140061 · Qinghai Telecom2
AS17622 · China Unicom Guangzhou network1
AS17621 · China Unicom Shanghai network1
AS140726 · UNICOM AnHui province network1