TCP SYN (p0f)

4:39+25:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-19 12:02 · last seen 2026-09-05 02:59 · 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 TTL39+25
Options length0
MSS1460
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_58ed7828516f6
t13d1812h1_85036bcba153_b26ce05bbdd63
t13d1515h1_8daaf6152771_0a20fe35d3a53
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
t13d1515h1_8daaf6152771_de4a06bb82e32
t13d301300_1d37bd780c83_c5cfab342c591
t13d2413h2_df98b6d6dfe4_1b3407e2c9361
t13d431000_c7886603b240_5ac7197df9d21
t13d4311h1_c7886603b240_7379471da2721
t13d2014h2_a09f3c656075_e42f34c56612 Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.5, urlsession 6.1.2, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1

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.9
ge11nn13enus_9db22d02e17a_000000000000_0000000000003
ge11nn14enus_4a2973d235de_000000000000_0000000000002
ge20nr05zhcn_8565061f331f_000000000000_0000000000001
ge11nr030000_0db47b7d240d_000000000000_0000000000001
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
ge11nn06enus_a8e344faf737_000000000000_0000000000001
ge11nr030000_cd680697de12_000000000000_0000000000001
ge11nn07zhcn_ad6bb88d6320_000000000000_0000000000001
ge20nr08enus_1945e0741196_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:1073741824;2:0|1073676289|0|m,p,s,a1
2:0;3:100;4:2097152;9:1|10420225|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.5, safari 26.4, +2 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_1460_718

User-Agent

fingerprintco-occurrences
Go-http-client/1.12
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.362
Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0;1
Mozilla/5.0 (compatible)1
Mozilla/5.0 (Windows NT 6.1; rv:60.0) Gecko/20100101 Firefox/60.01
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.361
Mozilla/5.0 (iPad; CPU OS 17_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Mobile/15E148 Safari/604.11
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.361
Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.67 Safari/537.361

Country

fingerprintco-occurrences
IL · Israel6
AR · Argentina4
KR · South Korea1
JP · Japan1
PL · Poland1
EE · Estonia1
UZ · Uzbekistan1
CN · China1
CO · Colombia1
IQ · Iraq1

Network (ASN)

fingerprintco-occurrences
AS1680 · Cellcom Fixed Line Communication L.P4
AS27813 · Teledifusora S.A.3
AS45102 · Alibaba (US) Technology Co., Ltd.2
AS12849 · Hot-Net internet services Ltd.2
AS16276 · OVH SAS1
AS49604 · Zone Media OU1
AS59668 · Turon Media XK1
AS262187 · Patagonia Green S.A.1
AS4837 · CHINA UNICOM China169 Backbone1
AS271957 · SOMOS NETWORKS COLOMBIA S.A.S. BIC1