TCP SYN (p0f)

4:54+10:0:1460:mss*44,8:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-25 21:09 · last seen 2026-09-15 02:58 · JSON

Last 7 days (2 observations)

Distinct clients per day (last 30 days, peak 2/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 TTL54+10
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
t13d1515h1_8daaf6152771_0a20fe35d3a53
t13d1617h2_86a278354501_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.3, +10 more.The fingerprint page shows the full measured match list. More on the catalog.2
t13d1515h1_8daaf6152771_de4a06bb82e32
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.2
t13d491200_bd868743f55c_7c76daad20ec1
t13d1712h1_ab0a1bf427ad_8e6e362c5eac1
t13d1211h2_7d69600fc74c_9ced094328c91
t13d1516h1_8daaf6152771_1a63afa7c4781
t13d3113h2_e8f1e7e78f70_1b3407e2c9361

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn14enus_4a2973d235de_000000000000_0000000000003
ge11nn13enus_9db22d02e17a_000000000000_0000000000003
ge20nr12enus_979a40433f82_000000000000_0000000000002
ge11nn060000_ce3694e9b763_000000000000_0000000000001
ge11nn040000_e1d2031bdfea_000000000000_0000000000001
ge20nn04enus_989c7cc05c9b_000000000000_0000000000001
ge20nr030000_ff50983941c1_000000000000_0000000000001
ge20nr13enus_05d774e75578_000000000000_0000000000001
ge20nn14enus_d9ad99aff99a_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:131072;5:16384|12517377|11:0:0:22|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|9:0:0:22|m,p,a,s1
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p1
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.The fingerprint page shows the full measured match list. More on the catalog.1
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.1
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.1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_813

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:151.0) Gecko/20100101 Firefox/151.02
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
Mozilla/5.0 (compatible; Barkrowler/0.9; +https://babbar.tech/crawler)1
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.361
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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.7 Safari/537.361
Mozilla/5.0 (Linux; Android 8.1.0; PVG100) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Mobile Safari/537.361

Country

fingerprintco-occurrences
US · United States7
NL · Netherlands5
FR · France1
HU · Hungary1

Network (ASN)

fingerprintco-occurrences
AS9009 · M247 Europe SRL5
AS49981 · WorldStream B.V.4
AS212238 · Datacamp Limited1
AS211619 · MAXKO d.o.o.1
AS208172 · Proton AG1
AS210743 · Babbar SAS1
AS60404 · Liteserver1

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).

fingerprintlinked observations
q13d0311h3_55b375c5d22e_653d80c3fe9d1