TCP SYN (p0f)
4:57+7:0:1276:mss*34,12:mss,sok,ts,nop,ws:df,id+:0
first seen 2026-07-02 12:55 · last seen 2026-10-29 22:20 · 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
| IP version | 4 |
|---|---|
| Initial TTL | 57+7 |
| Options length | 0 |
| MSS | 1276 |
| Window size | mss*34 |
| Window scale | 12 |
| 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 |
|---|---|
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. | 4 |
t13d5212h1_b262b3658495_8e6e362c5eac Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.21.0, node-fetch 24.19.0, node-fetch 22.23.1, +9 more.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
t13d1713h1_ab0a1bf427ad_ecd0401ec68b Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
t13d1812h1_85036bcba153_b26ce05bbdd6 | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr110000_65ce3e7a57b3_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 156.0.8078.4, chromium 153.0.8010.12, +13 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
ge11nn050000_be0d0b335e46_000000000000_000000000000 | 1 |
ge20nn120000_1d5643f8516d_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 156.0.8078.4, chromium 153.0.8010.12, +13 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
ge11nn07*000_131b6413da1e_000000000000_000000000000 | 1 |
ge11nn06enus_fb4afd1f380a_000000000000_000000000000 | 1 |
ge20nn05*000_754588453448_000000000000_000000000000 | 1 |
ge11nn07enus_131b6413da1e_000000000000_000000000000 | 1 |
ge11nn07tr00_6c5989145a61_000000000000_000000000000 | 1 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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 152.0.7977.83, +85 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
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, +60 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 147.0.7727.15, chromium 145.0.7632.6, +26 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
2:0;4:262144|458753|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 26.13.0, node-fetch 26.4.0.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
43384_2-4-8-1-3_1276_12 | 10 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
SG · Singapore | 6 |
US · United States | 4 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS396982 · Google LLC | 6 |
AS16509 · Amazon.com, Inc. | 4 |
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. | 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 | 3 |