TCP SYN (p0f)

6:49+15:0:1440:mss*23,7:mss,sok,ts,nop,ws:flow:0

first seen 2026-10-01 23:48 · last seen 2026-10-23 22:43 · JSON

Distinct clients per day (last 30 days, peak 8/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 version6
Initial TTL49+15
Options length0
MSS1440
Window sizemss*23
Window scale7
Options layoutmss,sok,ts,nop,ws
Quirksflow
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
t13d3013h2_1d37bd780c83_8537cf56674e8
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.5
t13d141000_cbb2034c60b8_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.22.12.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_0000000000008
ge20nr09ru00_538441e4e116_000000000000_0000000000002
ge20nr08ru00_6fbeabe70649_000000000000_0000000000001
ge11nr030000_69803879d94f_000000000000_0000000000001
ge20nr08ru00_1945e0741196_000000000000_0000000000001
ge20nn08ru00_1945e0741196_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-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.8
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, +2 more.The fingerprint page shows the full measured match list. More on the catalog.5

TCP SYN (JA4T)

fingerprintco-occurrences
33120_2-4-8-1-3_1440_714

User-Agent

fingerprintco-occurrences
curl/8.14.18
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/27.0 Mobile/15E148 Safari/604.15
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
NL · Netherlands6
US · United States4
ES · Spain3
JP · Japan1

Network (ASN)

fingerprintco-occurrences
AS56971 · AS56971 Cloud5
AS136258 · BrainStorm Network, Inc4
AS56630 · Melbikomas UAB3
AS149440 · Evoxt Sdn. Bhd.1
AS200019 · ALEXHOST S.R.L.1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.8