TCP SYN (p0f)

4:117+11:0:1452:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0

first seen 2026-06-26 11:02 · last seen 2026-09-04 08:07 · JSON

Distinct clients per day (last 30 days, peak 9/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 TTL117+11
Options length0
MSS1452
Window size65535
Window scale8
Options layoutmss,nop,ws,nop,nop,sok
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
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.18
t13d2913h1_723694b0fccc_5671b5df502912
t13d201200_2b729b4bf6f3_e24568c0d4401
t13d1713h1_ab0a1bf427ad_ecd0401ec68b Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1617h2_86a278354501_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.3, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1515h1_8daaf6152771_de4a06bb82e31

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr16eses_94fdc06e0694_000000000000_0000000000006
ge11nr11eses_835281d8e5d9_000000000000_0000000000003
ge20nr16engb_94fdc06e0694_000000000000_0000000000002
ge11nr11eses_b350a6a7c155_000000000000_0000000000002
ge20nr16dede_94fdc06e0694_000000000000_0000000000002
ge20nr14plpl_b627e55c4c56_000000000000_0000000000001
po11nn07enin_7d361e250c48_000000000000_0000000000001
ge20nr16enau_94fdc06e0694_000000000000_0000000000001
he11nn040000_66d37a417839_000000000000_0000000000001
ge20nn16soso_94fdc06e0694_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.18
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-4_1452_833

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (iPad; CPU OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Mobile/15E148 Safari/604.15
Mozilla/5.0 (iPhone; CPU iPhone OS 18_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0 Mobile/15E148 Safari/604.13
Mozilla/5.0 (iPad; CPU OS 18_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0 Mobile/15E148 Safari/604.13
Mozilla/5.0 (Linux; Android 12; SM-S901B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.362
Mozilla/5.0 (Linux; Android 13; SM-S918B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.362
Mozilla/5.0 (Linux; Android 13; Pixel 7 Pro) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.362
Mozilla/5.0 (Linux; Android 13; Redmi Note 12) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 6.2; x64) AppleWebKit/537.36 (KHTML, like Gecko) Opera/70.0.0.0 Safari/537.361
Python/3.11 aiohttp/3.14.11

Country

fingerprintco-occurrences
ES · Spain13
GB · United Kingdom8
DE · Germany3
MX · Mexico2
PE · Peru2
PL · Poland1
IN · India1
AU · Australia1
ID · Indonesia1
BD · Bangladesh1

Network (ASN)

fingerprintco-occurrences
AS5378 · Vodafone Limited8
AS3352 · TELEFONICA DE ESPANA S.A.U.6
AS6739 · Vodafone ONO AS4
AS12430 · VODAFONE ESPANA S.A.U.3
AS8881 · 1&1 Versatel GmbH2
AS8151 · Uninet S.A. de C.V.2
AS269843 · BANTEL SAC2
AS5617 · Orange Polska Spolka Akcyjna1
AS17488 · Hathway IP Over Cable Internet1
AS7545 · TPG Telecom Limited1