TCP SYN (p0f)

4:111+17:0:1440:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0

first seen 2026-06-11 20:57 · last seen 2026-10-29 16:05 · JSON

Last 7 days (2 observations)

Distinct clients per day (last 30 days, peak 3/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 TTL111+17
Options length0
MSS1440
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
t13d1518h2_8daaf6152771_e2d80978ab2e Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 154.0.8037.57, chrome 152.0.7977.64, +24 more.The fingerprint page shows the full measured match list. More on the catalog.147
t13d201100_2b729b4bf6f3_36bf25f296df137
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.61
t13d1517h2_8daaf6152771_cb7bf5808d99 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 154.0.8037.57, chrome 152.0.7977.64, +24 more.The fingerprint page shows the full measured match list. More on the catalog.18
t13d1312h2_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.10, go-net/http 1.26.9, +7 more.The fingerprint page shows the full measured match list. More on the catalog.10
t13d1516h1_8daaf6152771_d8a2da3f94cd8
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, +28 more.The fingerprint page shows the full measured match list. More on the catalog.3
t13d1812h1_85036bcba153_b26ce05bbdd62
t13d1517h2_8daaf6152771_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 155.0.1, firefox 154.0, firefox 156.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog.2
t13d1515h1_8daaf6152771_0a20fe35d3a52

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn16enus_a27292610b04_000000000000_000000000000101
ge11nn010000_4a823118b9ba_000000000000_00000000000020
ge11nn010000_4740ae6347b0_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: rust-hyper 1.11.1, rust-hyper 1.11.0, rust-hyper 1.12.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.12
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.6
ge11nn15enus_35372a7bda31_000000000000_0000000000002
ge11nn16enus_35f3f038964b_000000000000_0000000000002
ge11nn14enus_4a2973d235de_000000000000_0000000000002
ge11nn14zhcn_535d0194b751_000000000000_0000000000002
ge11nr13zhcn_91857df34c2b_000000000000_0000000000002
po11nn060000_7ba2d3693069_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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 1.26.10, go-net/http 1.26.9, +8 more.The fingerprint page shows the full measured match list. More on the catalog.52
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.27
1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p13
1:65536;2:0;4:6291456;6:262144|15663105|1:0:0:256|m,a,s,p13
1:65536;2:0;4:6291456;6:262144|15663105|9:0:0:256|m,a,s,p8
1:65536;2:0;4:6291456;6:262144|15663105|5:0:0:256|m,a,s,p6
1:65536;2:0;4:6291456;6:262144|15663105|13:0:0:256|m,a,s,p6
1:65536;2:0;4:6291456;6:262144|15663105|17:0:0:256|m,a,s,p6
1:65536;2:0;4:6291456;6:262144|15663105|21:0:0:256|m,a,s,p6
1:65536;2:0;4:6291456;6:262144|15663105|25:0:0:256|m,a,s,p6

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-4_1440_8379

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/537.36238
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36105
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.364
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:157.0) Gecko/20100101 Firefox/157.02
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.361
python-requests/2.32.41

Country

fingerprintco-occurrences
CN · China239
CA · Canada83
US · United States30
HK · Hong Kong SAR China9
CH · Switzerland7
BR · Brazil5
SG · Singapore4
KR · South Korea4
AU · Australia3
ID · Indonesia3

Network (ASN)

fingerprintco-occurrences
AS4134 · CHINANET BACKBONE239
AS8075 · Microsoft Corporation141
AS2856 · British Telecommunications Limited2
AS7418 · TELEFÓNICA CHILE S.A.2
AS1267 · WIND TRE S.P.A.2
AS28649 · Desktop Sigmanet Comunicação Multimídia SA2
AS7545 · TPG Telecom Limited1
AS18403 · FPT Telecom Company1
AS3816 · COLOMBIA TELECOMUNICACIONES S.A. ESP BIC1
AS53181 · Avanca Telecom e Servicos LTDA1

TLS supported groups

fingerprintco-occurrences
001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, powershell 7.6.8, +1 more.The fingerprint page shows the full measured match list. More on the catalog.3
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 157.0.1, firefox-esr 153.5.1esr, firefox 158.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.2
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1
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
q13d0315h3_55b375c5d22e_dc5437974b471
q13d0312h3_55b375c5d22e_178839b6cec11