TCP SYN (p0f)

4:47+17:0:1400:mss*20,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-14 17:25 · last seen 2026-09-14 16:19 · JSON

Last 7 days (2 observations)

Distinct clients per day (last 30 days, peak 1/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 TTL47+17
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
t13i170900_5b57614c22b0_78e6aca7449b4
t13d191000_9dc949149365_e7c2852226513
t13d491000_834380eab35e_5ac7197df9d23
t13d4312h1_c7886603b240_b26ce05bbdd62

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn020000_3ed38b250d3d_000000000000_0000000000003
ge11nn070000_f1c095c421c4_000000000000_0000000000003
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.2
ge11nn050000_59c4493676a6_000000000000_0000000000001
ge11nn050000_7426b1434792_000000000000_0000000000001
ge11nn050000_85f6e957a2ce_000000000000_0000000000001
ge11nn050000_3658ef221638_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.21.4, wget 1.21.3, wget 1.25.0.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
29200_2-4-8-1-3_1400_79

User-Agent

fingerprintco-occurrences
libredtail-http4
Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/120.0.0.02
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/5.051975669 Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.361
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 · China8
US · United States4

Network (ASN)

fingerprintco-occurrences
AS4837 · CHINA UNICOM China169 Backbone4
AS53667 · FranTech Solutions4
AS17622 · China Unicom Guangzhou network3
AS4134 · CHINANET BACKBONE1