TCP SYN (JA4T)

65320_2-4-8-1-3_1420_10

first seen 2026-06-29 23:59 · last seen 2026-10-31 16:59 · JSON

Last 7 days (137 observations)

Distinct clients per day (last 30 days, peak 10/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

TCP window65320
Option kinds2-4-8-1-3
MSS1420
Window scale10

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.1330
t13d1114h2_c5d436628c5c_d2ecb6802617124
t13d141100_cbb2034c60b8_e5728521abd4123
t13d1011h1_61a7ad8aa9b6_3a8073edd8ef44
t13d190900_9dc949149365_97f8aa674fd97
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.6
t13d3013h2_1d37bd780c83_8537cf56674e3
t13d1712h1_ab0a1bf427ad_882d495ac3813
t13d1312h2_f57a46bbacb6_f50d94e863eb Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.1, go-net/http 1.27.0, go-net/http 1.27.3, +1 more.The fingerprint page shows the full measured match list. More on the catalog.3
t13d131100_f57a46bbacb6_f50d94e863eb Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.1, go-net/http 1.27.3, go-net/http 1.27.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.3

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr050000_857b5fa3405d_000000000000_000000000000204
ge20nn050000_857b5fa3405d_000000000000_000000000000183
ge20nr050000_277e78b0d503_000000000000_000000000000143
ge20nr050000_bb384e635ab6_000000000000_000000000000133
ge20nr050000_7e80a5f53adf_000000000000_000000000000127
ge20nn04enus_39a3ba4480e8_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: urlsession 6.1.2.The fingerprint page shows the full measured match list. More on the catalog.81
ge11nr06enus_aeac3047b50b_000000000000_00000000000066
ge20nn020000_fb4f949fd323_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.8.The fingerprint page shows the full measured match list. More on the catalog.64
ge20nn050000_7e80a5f53adf_000000000000_00000000000058
ge11nn050000_a1c329e38462_000000000000_00000000000057

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:4194304;5:16384;6:262144;1:65536|1073741824|0|a,m,p,s1300
2:0;4:65535|67043329|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.8.The fingerprint page shows the full measured match list. More on the catalog.124
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.34
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.3
2:0;4:4194304;5:1048576;6:65856|1073741824|0|a,m,p,s3
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.2
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 155.0.1, +31 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:131072;5:16384|12517377|11:0:0:42|m,p,a,s1
1:139264;2:0;4:121760;5:16384|12517377|3:0:0:42|m,p,a,s1

TCP SYN (p0f)

fingerprintco-occurrences
4:58+6:0:1420:mss*46,10:mss,sok,ts,nop,ws:df,id+:01634
4:47+17:0:1420:mss*46,10:mss,sok,ts,nop,ws:df,id+:08
4:55+9:0:1420:mss*46,10:mss,sok,ts,nop,ws:df,id+:05
4:57+7:0:1420:mss*46,10:mss,sok,ts,nop,ws:df,id+:04
4:50+14:0:1420:mss*46,10:mss,sok,ts,nop,ws:df,id+:02
4:52+12:0:1420:mss*46,10:mss,sok,ts,nop,ws:df,id+:01
4:54+10:0:1420:mss*46,10:mss,sok,ts,nop,ws:df,id+:01
4:59+5:0:1420:mss*46,10:mss,sok,ts,nop,ws:df,id+:01
4:51+13:0:1420:mss*46,10:mss,sok,ts,nop,ws:df,id+:01
6:56+8:0:1420:mss*46,10:mss,sok,ts,nop,ws:flow:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/153.0.0.0 Safari/537.36242
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36123
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.3681
Mozilla/5.0 (compatible; cohere-ai; +https://cohere.com/crawler)46
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.3645
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.3643
Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)37
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +claudebot@anthropic.com)37
Mozilla/5.0 (compatible; YouBot/1.0; +https://you.com/bot)36
Mozilla/5.0 (compatible; Hunyuan/1.0; +https://hunyuan.tencent.com/)35

Country

fingerprintco-occurrences
TW · Taiwan696
BE · Belgium350
US · United States289
SG · Singapore258
NL · Netherlands36
UA · Ukraine8
CA · Canada4
KR · South Korea3
IT · Italy3
JP · Japan2

Network (ASN)

fingerprintco-occurrences
AS396982 · Google LLC1648
AS34700 · MAXNET TELECOM, LTD8
AS5645 · TekSavvy Solutions, Inc.1
AS25820 · IT7 Networks Inc1

TLS supported groups

fingerprintco-occurrences
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.864
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.51
001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13.The fingerprint page shows the full measured match list. More on the catalog.44
11ec,001d,0017,0018,0019,02025
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.4
11ec,11eb,11ed,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.3, go-net/http 1.26.10.The fingerprint page shows the full measured match list. More on the catalog.4
0017,0018,0019,001d,001e,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: wget2 1.99.1, wget 1.21.3, webkit 27.2.The fingerprint page shows the full measured match list. More on the catalog.1

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_bb76f32061e32