TCP SYN (p0f)

4:55+9:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-25 09:01 · last seen 2026-09-15 04:33 · JSON

Last 7 days (6 observations)

Distinct clients per day (last 30 days, peak 4/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 TTL55+9
Options length0
MSS1460
Window sizemss*44
Window scale10
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
t13d4113h2_8ae0994cad11_86f67be995ff91
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.62
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.45
t13d1615h2_86a278354501_a54fffd0eb6137
t13d1614h2_86a278354501_53a6d0ab1c429
t13d1715h2_5b57614c22b0_a54fffd0eb617
t13d201100_2b729b4bf6f3_36bf25f296df6
t13d1714h2_5b57614c22b0_53a6d0ab1c425
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.5
t13d1517h2_8daaf6152771_b6f405a00624 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 149.0.7827.102, chromium 149.0.7827.102, chrome 149.0.7827.201, +21 more.The fingerprint page shows the full measured match list. More on the catalog.4

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog.71
ge20nr12engb_54b4638ab28b_000000000000_00000000000060
ge20nr12enus_a72b71f519fc_000000000000_00000000000024
ge20nr13engb_0c2c1d640f3e_000000000000_00000000000016
ge20nr11enus_187a9385d229_000000000000_00000000000014
ge20nr13engb_54728652be35_000000000000_00000000000011
he20nn020000_5594a17e7e7e_000000000000_0000000000009
ge20nn030000_042112399351_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0.The fingerprint page shows the full measured match list. More on the catalog.8
ge20nr14engb_4600588ae5ca_000000000000_0000000000007
ge20nr13enus_47bedc02e943_000000000000_0000000000006

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, +7 more.The fingerprint page shows the full measured match list. More on the catalog.96
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.72
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.29
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.23
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.20
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.6
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:256|m,a,s,p3
1:65536;2:0;4:131072;5:16384|12517377|27:0:0:42|m,p,a,s2
1:65536;2:0;4:131072;5:16384|12517377|19:0:0:42|m,p,a,s2
1:65536;2:0;4:131072;5:16384|12517377|21:0:0:42|m,p,a,s2

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_10234

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.3684
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.3662
Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.039
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.3628
Mozilla/5.0 (X11; Linux x86_64; rv:151.0) Gecko/20100101 Firefox/151.014
Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.012
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.3612
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.365
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.364
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.363

Country

fingerprintco-occurrences
AU · Australia271
NL · Netherlands7
US · United States6
DE · Germany3
SG · Singapore3
TR · Turkey3
CH · Switzerland2
CA · Canada2

Network (ASN)

fingerprintco-occurrences
AS38195 · Superloop271
AS137409 · GSL Networks Pty LTD7
AS62240 · Clouvider4
AS59642 · UAB Cherry Servers4
AS31898 · Oracle Corporation3
AS9009 · M247 Europe SRL2
AS212238 · Datacamp Limited2
AS60068 · Datacamp Limited1
AS396356 · Latitude.sh1
AS206092 · F.N.S. HOLDINGS LIMITED1

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_653d80c3fe9d75
q13d0315h3_55b375c5d22e_bb76f32061e311
q13d0413h3_9caa18292e23_23fce1e67d987
q13d0313h3_55b375c5d22e_fc7519ff7bc25
q13d0312h3_55b375c5d22e_5a06198afb932
q13d0312h3_55b375c5d22e_178839b6cec11
q13d0307h3_55b375c5d22e_1cecd519fee81