TCP SYN (p0f)

4:107+21:0:1440:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:0

first seen 2026-06-20 00:59 · last seen 2026-10-25 11:03 · JSON

Last 7 days (1 observations)

Distinct clients per day (last 30 days, peak 1/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 TTL107+21
Options length0
MSS1440
Window sizemss*44
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.8
t13d1812h1_85036bcba153_d41ae481755e1
t13d1515h1_8daaf6152771_0a20fe35d3a51
t12d190800_d83cc789557e_7af1ed941c261
t13d2913h1_723694b0fccc_5671b5df50291

HTTP request (JA4H)

fingerprintco-occurrences
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, +36 more.The fingerprint page shows the full measured match list. More on the catalog.2
ge20nr18enus_847f5aa0f578_000000000000_0000000000002
ge20nr19enus_9921e9511126_000000000000_0000000000002
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.1
po11nn07enus_7d361e250c48_000000000000_0000000000001
ge11nn14enus_4a2973d235de_000000000000_0000000000001
ge11nr11soso_835281d8e5d9_000000000000_0000000000001
ge20nr16arso_94fdc06e0694_000000000000_0000000000001
ge20nn19enus_9921e9511126_000000000000_0000000000001

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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.5
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 152.0.7977.83, +81 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:6291456;6:262144|15663105|3:1:1:256|m,a,s,p1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-1-3-1-1-4_1440_811

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.7444.162 Safari/537.365
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.361
Jetpack by WordPress.com (Jetpack 12.5; WordPress 6.4)1
Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Mobile/15E148 Safari/604.11
Mozilla/5.0 (Linux; Android 13; 2211133C) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.361

Country

fingerprintco-occurrences
NL · Netherlands5
BR · Brazil3
BD · Bangladesh2
SG · Singapore1
GQ · Equatorial Guinea1

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation6
AS18881 · TELEFÔNICA BRASIL S.A2
AS142615 · SARKER COMMUNICATION1
AS138522 · Kazi Rajib Ferdous t/a Chocolate Broadband1
AS328311 · Conexxia Guinea Equatorial, S.L1
AS266268 · JND/AJA TELECOMUNICACOES1

TLS supported groups

fingerprintco-occurrences
0a0a,6399,001d,0017,00181

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_653d80c3fe9d2