TCP SYN (p0f)

4:112+16:0:1420:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0

first seen 2026-07-16 17:03 · last seen 2026-10-23 22:41 · JSON

Distinct clients per day (last 30 days, peak 10/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 TTL112+16
Options length0
MSS1420
Window size65535
Window scale8
Options layoutmss,nop,ws,nop,nop,sok
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
t13d3013h2_1d37bd780c83_8537cf56674e Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.12
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.10
t13d1617h2_86a278354501_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.3, +10 more.The fingerprint page shows the full measured match list. More on the catalog.5
t13d2913h1_723694b0fccc_5671b5df50292
t13d201200_2b729b4bf6f3_e24568c0d4401

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000012
ge20nr16nlnl_94fdc06e0694_000000000000_0000000000003
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +39 more.The fingerprint page shows the full measured match list. More on the catalog.2
ge20nr16deat_94fdc06e0694_000000000000_0000000000002
ge20nr13jajp_9e2b86631664_000000000000_0000000000002
po11nn07ptpt_7d361e250c48_000000000000_0000000000001
ge20nr16frbe_94fdc06e0694_000000000000_0000000000001
ge11nn11nlbe_835281d8e5d9_000000000000_0000000000001
ge20nr16nlbe_94fdc06e0694_000000000000_0000000000001
ge11nr11nlbe_b350a6a7c155_000000000000_0000000000001

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.12
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +60 more.The fingerprint page shows the full measured match list. More on the catalog.10
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.5

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-4_1420_830

User-Agent

fingerprintco-occurrences
curl/8.14.112
Mozilla/5.0 (Android 13; Mobile; rv:153.0) Gecko/153.0 Firefox/153.04
Mozilla/5.0 (iPhone; CPU iPhone OS 17_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Mobile/15E148 Safari/604.12
Mozilla/5.0 (Linux; Android 14; SM-S928B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.361
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; x86) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.0.0 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64; rv:153.0) Gecko/20100101 Firefox/153.01
Mozilla/5.0 (Linux; Android 13; Pixel 4a) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.361
Mozilla/5.0 (Linux; Android 14; 23127PN0CC) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.361

Country

fingerprintco-occurrences
JP · Japan15
BE · Belgium5
AT · Austria4
NL · Netherlands3
BR · Brazil1
MX · Mexico1
PT · Portugal1

Network (ASN)

fingerprintco-occurrences
AS17676 · SoftBank Corp.12
AS6848 · Telenet BV5
AS8412 · T-Mobile Austria GmbH4
AS2518 · BIGLOBE Inc.3
AS33915 · Vodafone Libertel B.V.3
AS12353 · Vodafone Portugal1
AS265594 · Television Internacional, S.A. de C.V.1
AS267265 · DINAMICA TELECOM LTDA1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.12
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