TCP SYN (p0f)

4:53+11:0:1460:mss*44,11:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-13 20:48 · last seen 2026-11-01 15:15 · JSON

Last 7 days (2118 observations)

Distinct clients per day (last 30 days, peak 21/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 TTL53+11
Options length0
MSS1460
Window sizemss*44
Window scale11
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
t13d311000_8ae6a2f5ac15_5ac7197df9d230473
t12i570500_2a2bed94251f_a1e9356827956
t13d3112h2_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.6
t13d0810h2_c5294ed87595_5603904660152
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
t13d3113h2_e8f1e7e78f70_1b3407e2c9361
t13d1510h2_8daaf6152771_5603904660151
t13d1512h2_8daaf6152771_cbb9361b6bf91
t13d0811h2_638943e67146_9ced094328c91
t13d1111h2_c518a4b3ee7f_9ced094328c91

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_be0d0b335e46_000000000000_00000000000030411
ge11nn040000_c3abebcf3d28_000000000000_00000000000062
ge20nn04enus_989c7cc05c9b_000000000000_00000000000015
ge20nn020000_e5a56608905c_000000000000_0000000000006
ge11nn040000_3d99853a3f52_000000000000_0000000000003
ge11nn020000_70500bd9c457_000000000000_0000000000003
ge11nr040000_8391bea91fb6_000000000000_0000000000001
ge20nr020000_5594a17e7e7e_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p15
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, curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.7

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_1130440

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)30473
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.366
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.5 Safari/537.362
Go-http-client/1.11
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.9 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.5 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.6 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.2 Safari/537.361

Country

fingerprintco-occurrences
US · United States30479
NO · Norway17
BR · Brazil6

Network (ASN)

fingerprintco-occurrences
AS209366 · SEMrush CY LTD30473
AS56655 · Gigahost AS17
AS174 · Cogent Communications, LLC6
AS265393 · FIRENET SERVIÇOS DE TELECOMUNICAÇÕES LTDA6

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,00185744
0017,0019,001c,001b,0018,001a,0016,000e,000d,000b,000c,0009,000a6