TCP SYN (p0f)

4:47+17:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-18 20:44 · last seen 2026-09-16 04:44 · JSON

Last 7 days (5 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 TTL47+17
Options length0
MSS1412
Window sizemss*46
Window scale7
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
t13d131000_f57a46bbacb6_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.7
t13d191000_9dc949149365_e7c2852226513
t13i170900_5b57614c22b0_78e6aca7449b2
t13d1911h2_9dc949149365_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr05zhcn_f3bb7aa45ec4_000000000000_0000000000007
ge11nn040000_8391bea91fb6_000000000000_0000000000002
ge11nn030000_0db47b7d240d_000000000000_0000000000001
ge20nr010000_73b42ef9ea4d_000000000000_0000000000001
ge11nn070000_d0d63ed74832_000000000000_0000000000001
ge11nn050000_c71bbc472f37_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:4194304;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
64952_2-4-8-1-3_1412_712

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.07
Go-http-client/1.12
libredtail-http2
Mozilla/5.0 (Macintosh; Intel Mac OS X 9_2) AppleWebKit/556.43 (KHTML, like Gecko) Chrome/66.0.1896 Safari/537.361

Country

fingerprintco-occurrences
US · United States5
DE · Germany3
JP · Japan3
SG · Singapore1
CN · China1

Network (ASN)

fingerprintco-occurrences
AS135377 · UCLOUD INFORMATION TECHNOLOGY (HK) LIMITED12
AS58466 · CHINANET Guangdong province network1