TCP SYN (p0f)

4:43+21:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-18 20:44 · last seen 2026-09-08 03:31 · JSON

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 TTL43+21
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
t13d191000_9dc949149365_e7c28522265119
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.2
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
ge11nn040000_8391bea91fb6_000000000000_00000000000015
ge11nn030000_0db47b7d240d_000000000000_0000000000003
ge11nr05zhcn_813e32c09d15_000000000000_0000000000001
ge20nr010000_73b42ef9ea4d_000000000000_0000000000001
ge11nn030000_32287c24fa5b_000000000000_0000000000001
ge11nr05zhcn_f3bb7aa45ec4_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_718

User-Agent

fingerprintco-occurrences
Go-http-client/1.113
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/120.0.0.02
Mozilla/5.0 (Macintosh; Intel Mac OS X 8_0_2) AppleWebKit/539.49 (KHTML, like Gecko) Chrome/74.0.1047 Safari/537.361
curl/7.29.01
Mozilla/5.0 (Macintosh; Intel Mac OS X 8_0_2) AppleWebKit/562.51 (KHTML, like Gecko) Chrome/105.0.1745 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/577.37 (KHTML, like Gecko) Chrome/59.0.2260 Safari/537.361
Mozilla/5.0 (Windows NT 7_1; Win64; x64) AppleWebKit/550.36 (KHTML, like Gecko) Chrome/95.0.1850 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/556.46 (KHTML, like Gecko) Chrome/85.0.2591 Safari/537.361

Country

fingerprintco-occurrences
HK · Hong Kong SAR China15
US · United States3
TH · Thailand2
CN · China2

Network (ASN)

fingerprintco-occurrences
AS135377 · UCLOUD INFORMATION TECHNOLOGY (HK) LIMITED20
AS23724 · IDC, China Telecommunications Corporation1
AS58466 · CHINANET Guangdong province network1