TCP SYN (p0f)

4:42+22:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 02:44 · last seen 2026-09-15 06:02 · JSON

Last 7 days (3 observations)

Distinct clients per day (last 30 days, peak 5/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 TTL42+22
Options length0
MSS1460
Window sizemss*44
Window scale7
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
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.145
t13d4412h1_fd39b124ee10_58ed7828516f42
t13d1812h1_85036bcba153_b26ce05bbdd612
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.11
t13d1515h1_8daaf6152771_de4a06bb82e39
t13d1515h1_8daaf6152771_0a20fe35d3a59
t12d1310h2_8b80da21ef18_e69ac49eb88f7
t13d121100_a538d02d76d5_f6eeaf393d2e6
t13d1517h2_8daaf6152771_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 154.0.1, firefox 155.0.1, +1 more.The fingerprint page shows the full measured match list. More on the catalog.5
t13d3112h1_e8f1e7e78f70_d41ae481755e4

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn140000_02563f2d0fa8_000000000000_000000000000103
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.49
ge20nr130000_8b0ff7948a7d_000000000000_00000000000034
ge11nn13enus_9db22d02e17a_000000000000_00000000000013
ge11nn14enus_a86c1525b786_000000000000_00000000000010
ge20nn07zhcn_441d50c9939d_000000000000_0000000000007
he11nn050000_b223a0ebb0b5_000000000000_0000000000006
ge11nn14enus_4a2973d235de_000000000000_0000000000006
ge20nr11enus_1d88e8a431b9_000000000000_0000000000004
ge20nn040000_60e0ac44f2fc_000000000000_0000000000004

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.108
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.37
1:65536;3:1000;4:6291456|15663105|1:1:0:256|m,a,s,p12
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.3
4:4194304;3:100|10485760|1:0:0:255|m,s,p,a2
3:100;4:33554432;2:0|33488897|0|m,p,s,a Match?Exact match in Thumbprint's published controlled catalog captures: php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.2
2:0;3:100;4:2097152;9:1|10420225|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.5, safari 26.4, +2 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|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

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_7282

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; bot)12
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.3610
Mozilla/5.0 (compatible; StackScopeBot/1.0; +https://stackscope.dev/bot)10
Mozilla/5.0 (iPhone; CPU iPhone OS 26_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/145.0.7632.108 Mobile/15E148 Safari/604.16
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 Edg/122.0.0.05
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.365
Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.05
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.3 Mobile/15E148 Safari/604.15
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.364
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.364

Country

fingerprintco-occurrences
DE · Germany164
UZ · Uzbekistan24
FI · Finland15
AR · Argentina15
ZA · South Africa10
CN · China9
RU · Russia8
FR · France6
SG · Singapore5
LV · Latvia5

Network (ASN)

fingerprintco-occurrences
AS24940 · Hetzner Online GmbH173
AS59668 · Turon Media XK23
AS16276 · OVH SAS10
AS37611 · AFRIHOST SP (PTY) LTD10
AS7303 · Telecom Argentina S.A.8
AS4837 · CHINA UNICOM China169 Backbone6
AS215373 · Sabiedriba ar ierobezotu atbildibu DELSKA Latvia5
AS50219 · Valence Technology Co.3
AS48715 · Sefroyek Pardaz Engineering PJSC2
AS45102 · Alibaba (US) Technology Co., Ltd.2

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
q13d0314h3_55b375c5d22e_61e396c58b1f1