TCP SYN (JA4T)
65535_2-4-8-1-3_1286_9
first seen 2026-07-03 19:35 · last seen 2026-10-28 02:07 · JSON
Last 7 days (1 observations)
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
| TCP window | 65535 |
|---|---|
| Option kinds | 2-4-8-1-3 |
| MSS | 1286 |
| Window scale | 9 |
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 |
|---|---|
t13d1616h2_86a278354501_eeeea6562960 | 10 |
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 |
t13d4312h1_c7886603b240_b26ce05bbdd6 | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr12engb_d82c6d999d30_000000000000_000000000000 | 5 |
ge20nr13engb_132e387f43f1_000000000000_000000000000 | 3 |
ge20nr14engb_23c42e3d0eec_000000000000_000000000000 | 2 |
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. | 1 |
ge11nr19engb_4e9b73ab7510_000000000000_000000000000 | 1 |
HTTP/2 frames (Akamai)
TCP SYN (p0f)
| fingerprint | co-occurrences |
|---|---|
4:54+10:0:1286:65535,9:mss,sok,ts,nop,ws:df,id+:0 | 10 |
4:50+14:0:1286:65535,9:mss,sok,ts,nop,ws:df,id+:0 | 2 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
PL · Poland | 10 |
FR · France | 1 |
BD · Bangladesh | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS41508 · ZINET.NET.PL Sp. z.o.o. | 10 |
AS12876 · Scaleway SAS | 1 |
AS150774 · EXABYTE LTD | 1 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
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. | 1 |
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 157.0.1, firefox-esr 153.5.1esr, firefox 158.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
Cross-transport links
TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).
| fingerprint | linked observations |
|---|---|
q13d0315h3_55b375c5d22e_dc5437974b47 | 3 |