TCP SYN (p0f)

4:45+19:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 03:26 · last seen 2026-09-15 09:48 · JSON

Last 7 days (6 observations)

Distinct clients per day (last 30 days, peak 6/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
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_58ed7828516f42
t13d1515h1_8daaf6152771_de4a06bb82e312
t13d1515h1_8daaf6152771_0a20fe35d3a59
t13i190800_9dc949149365_97f8aa674fd98
t12d130600_2d7513195f68_e51b7354d87f6
t12i130500_2d7513195f68_e51b7354d87f5
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
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +24 more.The fingerprint page shows the full measured match list. More on the catalog.2
t13d181100_85036bcba153_d41ae481755e1
t13d3613h1_bcee18a5b459_8537cf56674e1

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.43
ge11nn13enus_9db22d02e17a_000000000000_00000000000015
ge11nr040000_e1d2031bdfea_000000000000_0000000000008
ge11nr040000_88d30a62b7ad_000000000000_0000000000006
ge11nn14enus_4a2973d235de_000000000000_0000000000006
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.5
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +23 more.The fingerprint page shows the full measured match list. More on the catalog.2
ge11nn040000_66d37a417839_000000000000_0000000000001
ge11nr030000_0db47b7d240d_000000000000_0000000000001
ge11nr030000_cd680697de12_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.3
2:0;4:2097152;5:16384;6:16384|5177345|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.13.4, rust-reqwest 0.12.28, rust-reqwest 0.13.5, +3 more.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_778

User-Agent

fingerprintco-occurrences
Mozilla/5.0 zgrab/0.x19
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.364
Go-http-client/1.12
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/131.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.362

Country

fingerprintco-occurrences
BR · Brazil35
US · United States22
ZA · South Africa5
AR · Argentina5
BD · Bangladesh4
UZ · Uzbekistan3
EC · Ecuador3
CY · Cyprus2
CO · Colombia2
DE · Germany1

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation24
AS27699 · TELEFÔNICA BRASIL S.A7
AS26599 · TELEFÔNICA BRASIL S.A6
AS12365 · ISP Sarkor Telecom3
AS37611 · AFRIHOST SP (PTY) LTD2
AS9121 · Turk Telekomunikasyon Anonim Sirketi2
AS18881 · TELEFÔNICA BRASIL S.A2
AS52468 · UFINET PANAMA S.A.2
AS137823 · cloudone2
AS266298 · MWA INTERNET. COM LTDA - ME2