TCP SYN (p0f)

4:48+16:0:1420:65535,8:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-24 06:31 · last seen 2026-10-28 14:20 · JSON

Last 7 days (2 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 TTL48+16
Options length0
MSS1420
Window size65535
Window scale8
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
t13d4412h1_fd39b124ee10_58ed7828516f7
t13d1515h1_8daaf6152771_0a20fe35d3a54
t13d1515h1_8daaf6152771_de4a06bb82e33
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.2
t13d4312h1_c7886603b240_b26ce05bbdd61

HTTP request (JA4H)

fingerprintco-occurrences
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.8
ge11nn13enus_9db22d02e17a_000000000000_0000000000006
ge11nn14enus_4a2973d235de_000000000000_0000000000001
ge11nr16dede_3dfdba18536b_000000000000_0000000000001
ge11nr16frfr_3dfdba18536b_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1420_817

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64; rv:127.0) Gecko/20100101 Firefox/127.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.80 Safari/537.361
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.67 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Brave Chrome/87.0.4280.101 Safari/537.361

Country

fingerprintco-occurrences
PT · Portugal3
PK · Pakistan3
BR · Brazil2
BD · Bangladesh2
BE · Belgium1
IL · Israel1
VN · Vietnam1
PE · Peru1
EG · Egypt1
TN · Tunisia1

Network (ASN)

fingerprintco-occurrences
AS2860 · NOS COMUNICACOES, S.A.2
AS7552 · Viettel Group1
AS6848 · Telenet BV1
AS6810 · "Bezeq"- THE ISRAEL TELECOMMUNICATION CORP. LTD.1
AS28656 · BTT TELECOMUNICACOES S.A.1
AS12353 · Vodafone Portugal1
AS131471 · Login.Me (Pvt) Ltd1
AS37492 · Orange Tunisie1
AS8346 · SONATEL-AS Autonomous System1
AS58682 · Level3 Carrier Ltd.1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog.2