TCP SYN (p0f)

4:54+10:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-02 06:23 · last seen 2026-10-25 15:30 · JSON

Last 7 days (1 observations)

Distinct clients per day (last 30 days, peak 5/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 TTL54+10
Options length0
MSS1460
Window sizemss*29
Window scale9
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
t13d151100_8daaf6152771_ab7e3b40a677261
t13d1312h1_f57a46bbacb6_ab7e3b40a67752
t13d131100_f57a46bbacb6_f50d94e863eb Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.1, go-net/http 1.27.3, go-net/http 1.27.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.26
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.10
t13d1517h2_8daaf6152771_cb7bf5808d99 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 154.0.8037.57, chrome 152.0.7977.64, +24 more.The fingerprint page shows the full measured match list. More on the catalog.8
t13d131100_f57a46bbacb6_a089bac06eae8
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.6
t13d3013h2_1d37bd780c83_8537cf56674e5
t13d181000_5d04281c6031_78e6aca7449b3
t13i170900_5b57614c22b0_78e6aca7449b2

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr38enus_c9f28418db6b_000000000000_00000000000017
ge11nr39enus_1c19b8b5959c_000000000000_00000000000016
ge11nr39enus_8275968c859c_000000000000_00000000000016
ge11nr37enus_49f6cf8b676e_000000000000_00000000000016
ge11nr05enus_900748f1e0f3_000000000000_00000000000013
ge11nr40enus_4d2a4bd3cdc8_000000000000_00000000000011
ge11nr37enus_4fc02c8dab26_000000000000_00000000000011
ge11nr38enus_423680453bc1_000000000000_00000000000010
ge11nr41enus_fd8eed19052c_000000000000_00000000000010
ge11nr41enus_c0fe3e80018a_000000000000_0000000000009

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 152.0.7977.83, +81 more.The fingerprint page shows the full measured match list. More on the catalog.9
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.5
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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.5
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 147.0.7727.15, chromium 145.0.7632.6, +26 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 133.0.6943.16, chrome 156.0.8078.48, chrome 150.0.7871.128, +3 more.The fingerprint page shows the full measured match list. More on the catalog.2
2:0;4:4194304;5:1048576;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.1, go-net/http 1.27.0, go-net/http 1.27.3, +1 more.The fingerprint page shows the full measured match list. More on the catalog.2
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog.1
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:256|m,a,s,p1

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_9389

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.3633
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.3620
Mozilla/5.0 (Linux; U; Android 14; en-US; Redmi Note 13 Pro Build/UP1A.231005.007) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 UCBrowser/13.4.0.1306 Mobile Safari/537.3617
Mozilla/5.0 (iPhone; CPU iPhone OS 17_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Mobile/15E148 Safari/604.115
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:126.0) Gecko/20100101 Firefox/126.014
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:126.0) Gecko/20100101 Firefox/126.014
Mozilla/5.0 (Macintosh; Intel Mac OS X 14.5; rv:127.0) Gecko/20100101 Firefox/127.013
Mozilla/5.0 (Linux; Android 14; SM-S918B Build/UP1A.231005.007) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/25.0 Chrome/121.0.0.0 Mobile Safari/537.3613
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.3612
Mozilla/5.0 (Macintosh; Intel Mac OS X 14_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.1512

Country

fingerprintco-occurrences
US · United States343
SE · Sweden29
LV · Latvia12
SG · Singapore2
DE · Germany1
NL · Netherlands1
FR · France1

Network (ASN)

fingerprintco-occurrences
AS150303 · SoloRDP250
AS142430 · DIGI VPS78
AS203861 · Miteflux Technologies Ltd27
AS64267 · Sprious LLC12
AS42532 · SIA VEESP12
AS45102 · Alibaba (US) Technology Co., Ltd.2
AS174 · Cogent Communications, LLC2
AS209183 · AkhaliNet LLC2
AS29066 · velia.net Internetdienste GmbH1
AS219329 · FLASH EDGE INFORMATION TECHNOLOGY LLC1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.5
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.2
001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13.The fingerprint page shows the full measured match list. More on the catalog.1

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprintlinked observations
q13d0312h3_55b375c5d22e_178839b6cec15