TCP SYN (p0f)
4:49+15:0:1460:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:0
first seen 2026-06-23 17:02 · last seen 2026-08-22 16:48 · 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 version | 4 |
|---|---|
| Initial TTL | 49+15 |
| Options length | 0 |
| MSS | 1460 |
| Window size | 65535 |
| Window scale | 6 |
| Options layout | mss,nop,ws,nop,nop,ts,sok,eol+1 |
| Quirks | df,ecn |
| 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 |
|---|---|
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +24 more.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
t13d1712h1_ab0a1bf427ad_8e6e362c5eac | 3 |
t13d2013h2_a09f3c656075_7f0f34a4126d Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.4, safari 26.6.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
t13d1712h1_ab0a1bf427ad_882d495ac381 | 3 |
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
t13d1516h2_8daaf6152771_cd486ad61c78 | 1 |
t13d1714h1_5b57614c22b0_43ade6aba3df | 1 |
t13d4907h2_0d8feac7bc37_7395dae3b2f3 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nn05enus_3f99bc624e90_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: urlsession 6.3.2, urlsession 6.3.3.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
ge11nn050000_be0d0b335e46_000000000000_000000000000 | 2 |
ge20nr14enus_b627e55c4c56_000000000000_000000000000 | 1 |
ge11nn040000_e9f51a8d70f3_000000000000_000000000000 | 1 |
ge20nr13enus_477eefb733f8_000000000000_000000000000 | 1 |
ge20nn05enau_3f99bc624e90_000000000000_000000000000 | 1 |
he11nn050000_be0d0b335e46_000000000000_000000000000 | 1 |
ge11nn06enus_fb4afd1f380a_000000000000_000000000000 | 1 |
he11nn050000_b223a0ebb0b5_000000000000_000000000000 | 1 |
he11nn06enus_fb4afd1f380a_000000000000_000000000000 | 1 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
2:0;4:2097152;3:100;9:1|10485760|0|m,s,p,a | 3 |
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +43 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
65535_2-1-3-1-1-8-4-0-0_1460_6 | 14 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
US · United States | 10 |
GB · United Kingdom | 3 |
RS · Serbia | 3 |
AU · Australia | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS22773 · Cox Communications Inc. | 3 |
AS6128 · Cablevision Systems Corp. | 3 |
AS31042 · Yettel d.o.o. | 3 |
AS14593 · Space Exploration Technologies Corporation | 2 |
AS5089 · Virgin Media Limited | 2 |
AS20055 · Wholesail networks LLC | 2 |
AS7018 · AT&T Enterprises, LLC | 1 |
AS20001 · Charter Communications Inc | 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 |
|---|---|
q13d0311h3_55b375c5d22e_653d80c3fe9d | 2 |
q13d0315h3_55b375c5d22e_dc5437974b47 | 1 |