TCP SYN (p0f)

4:45+19:0:1460:mss*20,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-12 07:13 · last seen 2026-09-13 12:22 · JSON

Last 7 days (1 observations)

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 TTL45+19
Options length0
MSS1460
Window sizemss*20
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
t12d990700_a40d17a72bcb_4446390ac22421
t13d191000_9dc949149365_e7c28522265110
t12i130500_2d7513195f68_e51b7354d87f3
t12d490600_730fb1b0ac6a_a1e9356827953
t13i131000_f57a46bbacb6_ab7e3b40a6771
t13d1516h3_8daaf6152771_d8a2da3f94cd1
t12d090800_08d6d9b33cd7_9d38f905c14d1
t13i170900_5b57614c22b0_78e6aca7449b1
t13d1312h2_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +5 more.The fingerprint page shows the full measured match list. More on the catalog.1
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.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_08e7224bf8c7_000000000000_00000000000018
ge11nr040000_e1d2031bdfea_000000000000_0000000000008
ge11nn030000_042112399351_000000000000_0000000000004
ge11nr040000_88d30a62b7ad_000000000000_0000000000003
ge11nn07zhcn_ad6bb88d6320_000000000000_0000000000003
ge11nn040000_e1d2031bdfea_000000000000_0000000000002
ge20nr13zhcn_50f953bbeac5_000000000000_0000000000001
ge11nn040000_314255b4f893_000000000000_0000000000001
ge11nn070000_d0d63ed74832_000000000000_0000000000001
he20nr03enus_dc308f3700d9_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +43 more.The fingerprint page shows the full measured match list. More on the catalog.1
2:0;4:4194304;5:16384;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
29200_2-4-8-1-3_1460_735

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.2623.112 Safari/537.3621
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36 QIHU 360SE13
libredtail-http1
Mozilla/5.0 (compatible; Scanner/1.0)1
Dalvik/2.1.0 (Linux; U; Android 9.0; ZTE BA520 Build/MRA58K)1
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11) AppleWebKit/601.1.27 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/601.1.271
Mozilla/5.0 (Linux; Android 12; redroid12_arm64 Build/SQ1D.220205.004; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/122.0.6261.119 Mobile Safari/537.36 uni-app1
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.361
Mozilla/5.0 (compatible; YaK/1.0; http://linkfluence.com/; bot@linkfluence.com)1
Mozilla/5.0 (ZX-81; U; CP/M86; en-US; rv:1.8.0.1) Gecko/20060111 Firefox/1.5.0.11

Country

fingerprintco-occurrences
CN · China33
HK · Hong Kong SAR China6
US · United States1
CA · Canada1
ID · Indonesia1
TH · Thailand1

Network (ASN)

fingerprintco-occurrences
AS58461 · CT HangZhou IDC28
AS137951 · ASLINE LIMITED6
AS4134 · CHINANET BACKBONE3
AS16276 · OVH SAS1
AS397731 · EliteWork LLC1
AS136052 · PT Cloud Hosting Indonesia1
AS17638 · ASN for TIANJIN Provincial Net of CT1
AS136907 · HUAWEI CLOUDS1
AS37963 · Hangzhou Alibaba Advertising Co.,Ltd.1