TCP SYN (p0f)

4:49+15:0:1260:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:0

first seen 2026-08-28 08:05 · last seen 2026-10-28 21:28 · JSON

Last 7 days (3 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 version4
Initial TTL49+15
Options length0
MSS1260
Window size65535
Window scale6
Options layoutmss,nop,ws,nop,nop,ts,sok,eol+1
Quirksdf,ecn
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
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
t13d1410h2_f98f5dc5c741_4c1ab05529043

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr12engb_54b4638ab28b_000000000000_0000000000002
ge20nr09engb_5ad46a65401a_000000000000_0000000000002
ge20nn08engb_1945e0741196_000000000000_0000000000002
ge20nn13engb_9519c2577190_000000000000_0000000000001
ge20nn08engb_b65a39d4559c_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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, +3 more.The fingerprint page shows the full measured match list. More on the catalog.5
1:4096;2:0;3:100;4:6291456;5:16384;6:65535|2147418112|1:0:0:220|m,a,s,p2
1:4096;2:0;3:100;4:6291456;5:16384;6:65535|2147418112|1:0:0:256|m,a,s,p1

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-8-4-0-0_1260_68

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.6.2 Safari/605.1.155
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/156.0.0.0 Safari/537.363

Country

fingerprintco-occurrences
GB · United Kingdom5
NO · Norway3

Network (ASN)

fingerprintco-occurrences
AS16509 · Amazon.com, Inc.5
AS15659 · NextGenTel AS3

TLS supported groups

fingerprintco-occurrences
0017,0018,001d3