TCP SYN (p0f)

4:50+14:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 05:05 · last seen 2026-10-23 22:08 · JSON

Distinct clients per day (last 30 days, peak 3/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 TTL50+14
Options length0
MSS1460
Window sizemss*29
Window scale9
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
t13d191000_9dc949149365_e7c28522265150
t13d3515h1_8f004308c246_5c2c66f702b047
t13i191000_9dc949149365_e5728521abd44
t13d3013h2_1d37bd780c83_8537cf56674e4
t13i3514h1_8f004308c246_5c2c66f702b03
t13d351400_8f004308c246_5c2c66f702b03
t13i170900_5b57614c22b0_78e6aca7449b2
t13d4312h1_c7886603b240_b26ce05bbdd62
t13d311100_e8f1e7e78f70_d41ae481755e Match?Exact match in Thumbprint's published controlled catalog captures: rust-hyper 1.11.1, rust-hyper 1.11.0, rust-hyper 1.12.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13i351400_8f004308c246_d8a2da3f94cd1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_88d30a62b7ad_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.25.0.The fingerprint page shows the full measured match list. More on the catalog.29
ge11nn05zh00_4ee89fec50ea_000000000000_00000000000029
po11nn070000_ce951b014b9b_000000000000_00000000000024
ge11nn05zh00_ddc401472a00_000000000000_0000000000009
pr11nr020000_3ed38b250d3d_000000000000_0000000000004
ge11nn06zh00_d81147f3cea4_000000000000_0000000000004
ge20nn030000_bf75ddd0bb29_000000000000_0000000000003
ge11nn06zh00_e9dea1aac148_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
ge11nn07zh00_d7d6dffb19f3_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.4

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_960

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; Infrawatch/1.0; +https://infrawat.ch/)53
Mozilla/5.0 (Linux; Android 11; vivo 1906; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/87.0.4280.141 Mobile Safari/537.36 VivoBrowser/8.9.0.025
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.3611
curl/7.4.08
okhttp/3.14.95
-4
curl/8.14.13
libredtail-http2
Mozilla/5.01
Go-http-client/1.11

Country

fingerprintco-occurrences
DE · Germany58
CN · China50
NL · Netherlands4
US · United States2
KR · South Korea1
HK · Hong Kong SAR China1
FR · France1
IE · Ireland1

Network (ASN)

fingerprintco-occurrences
AS25369 · Hydra Communications Ltd54
AS4134 · CHINANET BACKBONE50
AS211443 · SINO WORLDWIDE TRADING LIMITED4
AS210546 · CHSL ONE LTD2
AS14061 · DigitalOcean, LLC1
AS701 · Verizon Business1
AS36352 · HostPapa1
AS12322 · Free SAS1
AS4766 · Korea Telecom1
AS62610 · Zenlayer Inc1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.3
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.2