TCP SYN (p0f)

4:56+8:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-16 14:52 · last seen 2026-09-14 15:47 · JSON

Last 7 days (24 observations)

Distinct clients per day (last 30 days, peak 2/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 TTL56+8
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
t13d141000_cbb2034c60b8_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.22.12.The fingerprint page shows the full measured match list. More on the catalog.35
t13d101000_61a7ad8aa9b6_3ea2f44fd1af9
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.4
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.4
t13d1312h2_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +5 more.The fingerprint page shows the full measured match list. More on the catalog.3
t13d141100_cbb2034c60b8_e5728521abd42
t13d1712h1_ab0a1bf427ad_882d495ac3812
t13d1515h1_8daaf6152771_0a20fe35d3a52
t13i170900_5b57614c22b0_78e6aca7449b2
t12d200700_22c523c4c553_2dae41c691ec1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr06enus_aeac3047b50b_000000000000_00000000000031
ge11nn050000_d36560cdd989_000000000000_0000000000005
ge11nn050000_fdb72fc7d4c1_000000000000_0000000000004
ge11nr050000_a1c329e38462_000000000000_0000000000004
ge20nr10enus_b3034183f430_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +21 more.The fingerprint page shows the full measured match list. More on the catalog.3
ge20nr020000_b89ce445e0b3_000000000000_0000000000003
ge20nr13engb_54728652be35_000000000000_0000000000002
ge11nn06enus_5f95bcd9e412_000000000000_0000000000002
ge11nn050000_2469c960a647_000000000000_0000000000001
ge20nr12engb_54b4638ab28b_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.3
2:0;4:4194304;5:16384;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.3
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.1
1:65536;2:0;4:131072;5:16384|12517377|5:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 154.0, firefox 153.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1
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.1
1:65536;2:0;4:131072;5:16384|12517377|7:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 155.0, firefox 154.0, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1
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.1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_1055

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.3635
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.369
Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.04
Go-http-client/2.03
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.362
libredtail-http2
Mozilla/5.0 (Windows NT 10.0; Win64; x64) Gecko/20100101 Firefox/120.0.12
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
NL · Netherlands44
US · United States15
CH · Switzerland4
DE · Germany2
CA · Canada2
AU · Australia1
CZ · Czechia1

Network (ASN)

fingerprintco-occurrences
AS218785 · TC DATACENTER LIMITED35
AS214472 · Offshore LC8
AS212238 · Datacamp Limited6
AS62240 · Clouvider6
AS206092 · F.N.S. HOLDINGS LIMITED5
AS23470 · ReliableSite.Net LLC2
AS38195 · Superloop1
AS9009 · M247 Europe SRL1
AS41564 · Orion Network Limited1
AS31898 · Oracle Corporation1

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_653d80c3fe9d1