TCP SYN (JA4T)

42340_2-1-1-4-1-3_1460_13

first seen 2026-06-29 23:12 · last seen 2026-10-27 20:38 · JSON

Last 7 days (3 observations)

Distinct clients per day (last 30 days, peak 2/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 window42340
Option kinds2-1-1-4-1-3
MSS1460
Window scale13

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
t13d1717h2_5b57614c22b0_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog.5
t13d181000_e8a523a41297_78e6aca7449b5
t13d1713h1_ab0a1bf427ad_ecd0401ec68b Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.3
t13d271200_c42a7efa14d1_a141b6f9fa1c3
t13d131000_f57a46bbacb6_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.2
t13d1517h2_8daaf6152771_dcad5a0539912
t12d430600_1ce71f0edbb1_a1e9356827951

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_487c3246ac94_000000000000_0000000000005
ge11nn050000_be0d0b335e46_000000000000_0000000000003
ge11nn11enus_59d4f6088dec_000000000000_0000000000002
ge20nn13enus_e66716e13e58_000000000000_0000000000002
ge20nn11fr00_3901d4197baf_000000000000_0000000000002
ge11nn040000_e1d2031bdfea_000000000000_0000000000001
ge11nn13enus_d65fb5eca537_000000000000_0000000000001
po11nn060000_26b3802e1dc5_000000000000_0000000000001
ge11nn060000_f3b4d7f72ec1_000000000000_0000000000001
ge20nn14fr00_9df0f3df2aec_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, +60 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, +32 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|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.1
1:65536;2:0;4:131072;5:16384|12517377|1:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|5:0:0:42|m,p,a,s1

TCP SYN (p0f)

fingerprintco-occurrences
4:119+9:0:1460:mss*29,13:mss,nop,nop,sok,nop,ws:df,id+:06
4:115+13:0:1460:mss*29,13:mss,nop,nop,sok,nop,ws:df,id+:04
4:114+14:0:1460:mss*29,13:mss,nop,nop,sok,nop,ws:df,id+:03
4:117+11:0:1460:mss*29,13:mss,nop,nop,sok,nop,ws:df,id+:03
4:110+18:0:1460:mss*29,13:mss,nop,nop,sok,nop,ws:df,id+:02
4:116+12:0:1460:mss*29,13:mss,nop,nop,sok,nop,ws:df,id+:02
4:109+19:0:1460:mss*29,13:mss,nop,nop,sok,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36 Edg/115.0.1901.2035
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.05
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.362
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/117.02
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/153.0.0.0 Safari/537.362
Mozilla/5.0 (X11; Linux x86_64; rv:125.0) Gecko/20100101 Firefox/125.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.361

Country

fingerprintco-occurrences
SE · Sweden6
FR · France5
FI · Finland5
US · United States4
RU · Russia1

Network (ASN)

fingerprintco-occurrences
AS46475 · Limestone Networks, Inc.7
AS59651 · AS QualityNetwork7
AS213954 · Global Transit Systems LLC5
AS26548 · PureVoltage Hosting Inc.1
AS43444 · Fast Servers (Pty) Ltd1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.3
11ec,11eb,11ed,001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.3