TCP SYN (p0f)
4:51+13:0:1460:mss*20,7:mss,sok,ts,nop,ws:df,id+:0
first seen 2026-07-14 19:35 · last seen 2026-10-23 22:40 · JSON
Distinct clients per day (last 30 days, peak 22/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 version | 4 |
|---|---|
| Initial TTL | 51+13 |
| Options length | 0 |
| MSS | 1460 |
| Window size | mss*20 |
| Window scale | 7 |
| Options layout | mss,sok,ts,nop,ws |
| Quirks | df,id+ |
| Payload class | 0 |
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)
| fingerprint | co-occurrences |
|---|---|
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. | 23 |
t13d4312h1_c7886603b240_b26ce05bbdd6 | 5 |
t13d311100_e8f1e7e78f70_009f82a63104 | 4 |
t12d130600_2d7513195f68_e51b7354d87f | 3 |
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. | 2 |
t13i1909h2_9dc949149365_97f8aa674fd9 | 1 |
t13d1515h2_8daaf6152771_de4a06bb82e3 | 1 |
t13d2613h2_2802a3db6c62_845d286b0d67 | 1 |
t13d751100_479067518aa3_24695f2957a7 | 1 |
t13d1012h2_61a7ad8aa9b6_dc02626b439c Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.11.27.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nn030000_bf75ddd0bb29_000000000000_000000000000 | 23 |
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog. | 5 |
ge11nr060000_47327f3c94e3_000000000000_000000000000 | 4 |
ge11nr040000_e1d2031bdfea_000000000000_000000000000 | 3 |
ge11nn06en00_c8b5fb2f281e_000000000000_000000000000 | 1 |
ge20nr030000_ff50983941c1_000000000000_000000000000 | 1 |
ge20nn08enus_1945e0741196_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.6.2, safari 26.4.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
ge20nr09enus_5ad46a65401a_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.6.2, safari 26.6.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
ge20nr020000_e5a56608905c_000000000000_000000000000 | 1 |
ge20nr19enau_c3a759f22203_000000000000_000000000000 | 1 |
HTTP/2 frames (Akamai)
| fingerprint | co-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. | 23 |
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, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
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. | 1 |
1:65536;2:0;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p | 1 |
4:4194304;3:100|10485760|1:0:0:255|m,s,p,a | 1 |
2:0;4:2097152;5:16384|5177345|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.11.27.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
29200_2-4-8-1-3_1460_7 | 42 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
ES · Spain | 23 |
US · United States | 12 |
FR · France | 3 |
AU · Australia | 1 |
NL · Netherlands | 1 |
BG · Bulgaria | 1 |
CZ · Czechia | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS8560 · IONOS SE | 23 |
AS14061 · DigitalOcean, LLC | 5 |
AS45102 · Alibaba (US) Technology Co., Ltd. | 3 |
AS7029 · Windstream Communications LLC | 2 |
AS7922 · Comcast Cable Communications, LLC | 2 |
AS50360 · Tamatiya EOOD | 1 |
AS41608 · NextGenWebs, S.L. | 1 |
AS3215 · Orange S.A. | 1 |
AS12322 · Free SAS | 1 |
AS5410 · Bouygues Telecom SA | 1 |
TLS supported groups
| fingerprint | co-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. | 23 |
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog. | 5 |
001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, winhttp 10.0.20348.1, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
001d,0017,0018,0019,001e,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: java-httpclient 17.0.19, java-httpclient 11.0.31, java-urlconnection 17.0.19, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |