TCP SYN (p0f)

6:41+23:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0

first seen 2026-06-26 03:34 · last seen 2026-10-30 19:06 · JSON

Last 7 days (17 observations)

Distinct clients per day (last 30 days, peak 47/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 version6
Initial TTL41+23
Options length0
MSS1440
Window sizemss*45
Window scale7
Options layoutmss,sok,ts,nop,ws
Quirksflow
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
t13d301000_1d37bd780c83_3550537cd59b1077
t13d1516h2_8daaf6152771_02713d6af862 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog.70
t13d1517h2_8daaf6152771_b1ff8ab2d16f26
t12d290700_fc2078a0b8c0_8c06664c3ac59
t13d521100_b262b3658495_8e6e362c5eac6
t13d3112h1_e8f1e7e78f70_d41ae481755e3
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.2
t13d2013h2_a09f3c656075_7f0f34a4126d Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.6.2, safari 26.4, +2 more.The fingerprint page shows the full measured match list. More on the catalog.2
t13d1518h2_8daaf6152771_4980c97edce02
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.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr08enus_002f1ef91713_000000000000_0000000000001061
ge20nr13enus_e2ac93ffb364_000000000000_00000000000096
ge11nr08enus_0b4981d9e830_000000000000_00000000000016
ge11nn050000_2469c960a647_000000000000_0000000000005
ge11nn040000_bfa5a9b89dd6_000000000000_0000000000004
ge11nn05en00_61812dc1cc58_000000000000_0000000000002
ge11nn030000_dd98166e0881_000000000000_0000000000002
ge11nn05enus_f3bb7aa45ec4_000000000000_0000000000002
ge20nr12dede_f8a3a1e39dc3_000000000000_0000000000002
ge11nr030000_0db47b7d240d_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.97
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.3
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 26.6.2, safari 26.5, +2 more.The fingerprint page shows the full measured match list. More on the catalog.2
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, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1
3:100;4:1073741824;2:0|1073676289|0|m,p,s,a1
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
64800_2-4-8-1-3_1440_71202

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.361063
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.3617
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.3617
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.3616
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.3614
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.3611
Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)9
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36 Edg/144.0.0.09
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.367
Mozilla/5.05

Country

fingerprintco-occurrences
FR · France1085
US · United States63
SG · Singapore33
DE · Germany8
PL · Poland5
IN · India5
RO · Romania2
SE · Sweden1
FI · Finland1
KZ · Kazakhstan1

Network (ASN)

fingerprintco-occurrences
AS51167 · Contabo GmbH1081
AS214483 · FiberPower LLC91
AS16276 · OVH SAS10
AS24940 · Hetzner Online GmbH6
AS47583 · Hostinger International Limited5
AS62610 · Zenlayer Inc5
AS36183 · Akamai Technologies, Inc.2
AS6805 · Telefonica Germany GmbH & Co.OHG2
AS63949 · Akamai Connected Cloud1
AS48716 · PS Internet Company LLP1

TLS supported groups

fingerprintco-occurrences
0a0a,001d,0017,001896
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.3.1, curl 7.88.1, curl 8.13.0, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.1