TCP SYN (p0f)

4:46+18:0:1460:mss*44,8:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-01 14:34 · last seen 2026-10-23 22:06 · JSON

Distinct clients per day (last 30 days, peak 1/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 TTL46+18
Options length0
MSS1460
Window sizemss*44
Window scale8
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
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
t13d191000_9dc949149365_e7c2852226511
t13d3013h2_1d37bd780c83_8537cf56674e 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.1
t13d3113h2_e8f1e7e78f70_1b3407e2c9361
t13d1515h1_8daaf6152771_de4a06bb82e31
t13d1512h2_8daaf6152771_cbb9361b6bf91
t13d1410h2_4f2acddecbd5_5603904660151
t13d0910h2_61fe612ce0fd_5603904660151
t13d1011h2_6a54648fab70_9ced094328c91
t13d1110h2_7e399b5cf5a1_5603904660151

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn04enus_989c7cc05c9b_000000000000_0000000000006
ge11nr030000_cd680697de12_000000000000_0000000000001
ge11nn040000_8391bea91fb6_000000000000_0000000000001
ge11nn13enus_9db22d02e17a_000000000000_0000000000001
ge20nn030000_bf75ddd0bb29_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,p6
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;4:33554432;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.1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_811

User-Agent

fingerprintco-occurrences
Go-http-client/1.12
curl/8.14.11
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.2 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.3 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.3 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3.5 Safari/605.1.151
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.3 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.19 Safari/605.1.151
Mozilla/5.0 (Linux; Android 9; SO-02K Build/47.2.B.5.38; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/74.0.3729.136 Mobile Safari/537.36 YJApp-ANDROID jp.co.yahoo.android.yjtop/3.35.01

Country

fingerprintco-occurrences
NO · Norway7
DE · Germany1
SG · Singapore1
RO · Romania1
FR · France1

Network (ASN)

fingerprintco-occurrences
AS56655 · Gigahost AS7
AS14061 · DigitalOcean, LLC1
AS21859 · Zenlayer Inc1
AS9009 · M247 Europe SRL1
AS16276 · OVH SAS1

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,00181
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.1