TCP SYN (p0f)

6:58+6:0:1220:65535,9:mss,sok,ts,nop,ws:flow:0

first seen 2026-10-12 16:57 · last seen 2026-10-28 00:20 · JSON

Last 7 days (65 observations)

Distinct clients per day (last 30 days, peak 52/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 TTL58+6
Options length0
MSS1220
Window size65535
Window scale9
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_8537cf56674e58
t13d3013h1_1d37bd780c83_8537cf56674e16
t13d3013h1_1d37bd780c83_ecd0401ec68b2
t13d301200_1d37bd780c83_ecd0401ec68b2

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog.58
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.13
ge11nn06enus_fb4afd1f380a_000000000000_0000000000003
ge11nn040000_5b1e8b5f4d2d_000000000000_0000000000002
ge11nn040000_e1d2031bdfea_000000000000_0000000000001
ge11nn05en00_91bf09848158_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.58

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1220_978

User-Agent

fingerprintco-occurrences
Mozilla/5.051
Mozilla/5.0 (Macintosh) Chrome/130 Safari/537.3611
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/124 Safari/537.366
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0 Safari/537.363
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0 Safari/537.362
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 Chrome/126 Safari/537.361
Mozilla/5.0 (research crawler; HN narrative experiment)1
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) Chrome/1201

Country

fingerprintco-occurrences
US · United States78

Network (ASN)

fingerprintco-occurrences
AS54113 · Fastly, Inc.78

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.77