TCP SYN (JA4T)

33120_2-4-8-1-3_1440_7

first seen 2026-08-24 07:53 · last seen 2026-10-23 22:43 · JSON

Distinct clients per day (last 30 days, peak 38/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 window33120
Option kinds2-4-8-1-3
MSS1440
Window scale7

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
t13d3013h2_1d37bd780c83_8537cf56674e38
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.5
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
t13d311100_e8f1e7e78f70_d41ae481755e 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.2
t13d141000_cbb2034c60b8_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.22.12.The fingerprint page shows the full measured match list. More on the catalog.1
t13d3012h2_1d37bd780c83_882d495ac381 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.21.0, curl 8.22.0, curl 8.23.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000038
ge11nn050000_ea6f06182064_000000000000_0000000000002
ge11nr05zhcn_f3bb7aa45ec4_000000000000_0000000000002
ge20nr09ru00_538441e4e116_000000000000_0000000000002
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge20nr08ru00_6fbeabe70649_000000000000_0000000000001
ge11nr030000_69803879d94f_000000000000_0000000000001
ge20nr08ru00_1945e0741196_000000000000_0000000000001
ge20nn08ru00_1945e0741196_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.39
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.5

TCP SYN (p0f)

fingerprintco-occurrences
6:49+15:0:1440:mss*23,7:mss,sok,ts,nop,ws:flow:014
6:48+16:0:1440:mss*23,7:mss,sok,ts,nop,ws:flow:010
6:47+17:0:1440:mss*23,7:mss,sok,ts,nop,ws:flow:09
6:51+13:0:1440:mss*23,7:mss,sok,ts,nop,ws:flow:09
6:56+8:0:1440:mss*23,7:mss,sok,ts,nop,ws:flow:03
6:50+14:0:1440:mss*23,7:mss,sok,ts,nop,ws:flow:02
6:46+18:0:1440:mss*23,7:mss,sok,ts,nop,ws:flow:01
6:43+21:0:1440:mss*23,7:mss,sok,ts,nop,ws:flow:01

User-Agent

fingerprintco-occurrences
curl/8.14.138
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/27.0 Mobile/15E148 Safari/604.15
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.02
Mozilla/5.0 (compatible; CT-WP-Probe/1.2)2
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
curl/8.19.01

Country

fingerprintco-occurrences
FR · France11
LV · Latvia8
NL · Netherlands6
IT · Italy5
US · United States4
DE · Germany3
ES · Spain3
AU · Australia2
CN · China2
JP · Japan1

Network (ASN)

fingerprintco-occurrences
AS56630 · Melbikomas UAB27
AS56971 · AS56971 Cloud7
AS136258 · BrainStorm Network, Inc4
AS16276 · OVH SAS3
AS63473 · HostHatch, LLC3
AS37963 · Hangzhou Alibaba Advertising Co.,Ltd.2
AS24940 · Hetzner Online GmbH1
AS149440 · Evoxt Sdn. Bhd.1
AS200019 · ALEXHOST S.R.L.1

TLS supported groups

fingerprintco-occurrences
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.38