TCP SYN (p0f)

4:43+21:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 10:51 · last seen 2026-09-16 00:58 · JSON

Last 7 days (1 observations)

Distinct clients per day (last 30 days, peak 3/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
MSS1440
Window sizemss*44
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
t13d4412h1_fd39b124ee10_58ed7828516f16
t13d1515h1_8daaf6152771_de4a06bb82e36
t13d1515h1_8daaf6152771_0a20fe35d3a54
t12i130500_2d7513195f68_e51b7354d87f1
t13d751100_479067518aa3_d41ae481755e1
t12d7008h1_0b90a0e79fbd_046e095b7c4a1
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.1
t13d5212h1_b262b3658495_8e6e362c5eac Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.19.0, node-fetch 22.23.1, node-fetch 24.21.0, +6 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1516h1_8daaf6152771_1a63afa7c4781
t13d181100_85036bcba153_d41ae481755e1

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.16
ge11nn13enus_9db22d02e17a_000000000000_0000000000009
ge11nn14enus_4a2973d235de_000000000000_0000000000002
ge11nn040000_88d30a62b7ad_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.25.0.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nr030000_cd680697de12_000000000000_0000000000001
ge11nr030000_0d34275228c4_000000000000_0000000000001
ge11nn020000_d5c75abc5c2c_000000000000_0000000000001
ge11nn12enus_c0f67fd42004_000000000000_0000000000001
ge11nn040000_5b1e8b5f4d2d_000000000000_0000000000001
ge11nn050000_3658ef221638_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.21.4, wget 1.21.3, wget 1.25.0.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1440_733

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.362
Go-http-client/1.11
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.361
Mozilla/5.0 zgrab/0.x1
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko; compatible; BuiltWith/1.4; rb.gy/xprgqj) Chrome/124.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
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 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
BR · Brazil13
US · United States4
RU · Russia3
UA · Ukraine2
BD · Bangladesh2
UZ · Uzbekistan2
NL · Netherlands1
GB · United Kingdom1
IN · India1
ZA · South Africa1

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation7
AS26599 · TELEFÔNICA BRASIL S.A3
AS25513 · PJSC Moscow city telephone network1
AS18403 · FPT Telecom Company1
AS18881 · TELEFÔNICA BRASIL S.A1
AS11845 · Vox Telecom Ltd1
AS23688 · Link3 Technologies Ltd.1
AS12365 · ISP Sarkor Telecom1
AS28183 · MICRON LINE SERVICOS DE INFORMATICA LTDA - ME1
AS18678 · INTERNEXA S.A. E.S.P1