TCP SYN (p0f)

4:112+16:0:1460:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0

first seen 2026-06-17 18:17 · last seen 2026-09-11 19:02 · JSON

Last 7 days (5 observations)

Distinct clients per day (last 30 days, peak 42/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
MSS1460
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
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.146
t13d2913h1_723694b0fccc_5671b5df5029107
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.20
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, +24 more.The fingerprint page shows the full measured match list. More on the catalog.15
t13d1807h2_796efca44d18_7395dae3b2f312
t13d1515h1_8daaf6152771_de4a06bb82e37
t13d1518h2_8daaf6152771_4980c97edce05
t13d1517h2_8daaf6152771_c4845d6bf6c55
t13d1515h1_8daaf6152771_0a20fe35d3a53
t13d1517h2_8daaf6152771_cb7bf5808d99 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 152.0.7977.64, chrome 152.0.7977.65, +5 more.The fingerprint page shows the full measured match list. More on the catalog.2

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr16nlnl_94fdc06e0694_000000000000_00000000000014
ge11nr11nlnl_835281d8e5d9_000000000000_00000000000011
ge20nr16nbno_94fdc06e0694_000000000000_00000000000010
ge11nn13enus_9db22d02e17a_000000000000_00000000000010
ge20nr12enus_54b4638ab28b_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, edge 151.0.4129.93, +36 more.The fingerprint page shows the full measured match list. More on the catalog.9
ge20nr16svse_94fdc06e0694_000000000000_0000000000008
ge20nr16engb_94fdc06e0694_000000000000_0000000000008
ge20nr16dadk_94fdc06e0694_000000000000_0000000000008
ge11nr11frbe_835281d8e5d9_000000000000_0000000000008
ge20nn14frfr_00c893c2b404_000000000000_0000000000007

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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, +43 more.The fingerprint page shows the full measured match list. More on the catalog.146
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.17
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog.16
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, +7 more.The fingerprint page shows the full measured match list. More on the catalog.12
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 147.0.7727.15, chromium 145.0.7632.6, +21 more.The fingerprint page shows the full measured match list. More on the catalog.3
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:220|m,a,s,p2
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 133.0.6943.16, chrome 150.0.7871.128, chromium 148.0.7778.96, +2 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:65536;2:0;4:6291456;6:262144|15663105|11:1:0:256|m,a,s,p1
1:65536;2:0;4:6291456;6:262144|15663105|13:1:0:256|m,a,s,p1

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-4_1460_8321

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.3613
Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.3613
Mozilla/5.0 (iPhone; CPU iPhone OS 18_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/150.0.0.0 Mobile/15E148 Safari/604.113
Mozilla/5.0 (iPhone; CPU iPhone OS 17_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Mobile/15E148 Safari/604.112
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.3612
Mozilla/5.0 (iPhone; CPU iPhone OS 16_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Mobile/15E148 Safari/604.112
Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/153.0 Mobile/15E148 Safari/604.110
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36 OPR/135.0.0.010
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36 Edg/149.0.0.08
Mozilla/5.0 (Linux; Android 14; SM-S921B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.368

Country

fingerprintco-occurrences
FR · France47
NL · Netherlands39
BE · Belgium27
NO · Norway23
DK · Denmark23
GB · United Kingdom21
US · United States20
IN · India20
SG · Singapore16
SE · Sweden16

Network (ASN)

fingerprintco-occurrences
AS12322 · Free SAS40
AS33915 · Vodafone Libertel B.V.35
AS6848 · Telenet BV26
AS55836 · Reliance Jio Infocomm Limited20
AS2119 · Telenor Norge AS19
AS14593 · Space Exploration Technologies Corporation16
AS5089 · Virgin Media Limited14
AS17547 · M1 NET LTD14
AS3292 · TDC Holding A/S8
AS9617 · JCOM Co., Ltd.8

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprintlinked observations
q13d0311h3_55b375c5d22e_653d80c3fe9d13
q13d0315h3_55b375c5d22e_dc5437974b472
q13d0312h3_55b375c5d22e_178839b6cec11