TCP SYN (p0f)

4:57+7:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 05:37 · last seen 2026-09-14 13:21 · JSON

Last 7 days (6 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 TTL57+7
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
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.235
t13d131000_f57a46bbacb6_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.9
t13d1812h1_85036bcba153_d41ae481755e9
t13d181100_85036bcba153_d41ae481755e8
t13d3515h1_8f004308c246_5c2c66f702b04
t13d131300_f57a46bbacb6_fb48f8b98a293
t13i130900_f57a46bbacb6_e7c2852226512
t13i170900_5b57614c22b0_78e6aca7449b2
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.2
t13i190800_9dc949149365_97f8aa674fd91

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn11enus_dbdd560af68b_000000000000_000000000000189
ge20nr12enus_54b4638ab28b_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, edge 151.0.4129.93, +36 more.The fingerprint page shows the full measured match list. More on the catalog.17
ge20nr13ruru_0c2c1d640f3e_000000000000_00000000000011
ge11nn040000_e1d2031bdfea_000000000000_0000000000009
ge11nn030000_52193b36b64e_000000000000_0000000000008
ge11nr040000_8391bea91fb6_000000000000_0000000000007
ge20nr12ruru_54b4638ab28b_000000000000_0000000000006
ge20nr13ruru_9519c2577190_000000000000_0000000000005
ge11nr020000_f24fcf356134_000000000000_0000000000003
ge11nn020000_3ed38b250d3d_000000000000_0000000000003

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 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog.201
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.9
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, +21 more.The fingerprint page shows the full measured match list. More on the catalog.6
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:256|m,a,s,p4
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 150.0.7871.128, chromium 148.0.7778.96, +2 more.The fingerprint page shows the full measured match list. More on the catalog.4
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:256|m,a,s,p2
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:256|m,a,s,p2
1:65536;2:0;4:6291456;6:262144|15663105|9:1:0:256|m,a,s,p2
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.2
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:220|m,a,s,p1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_7275

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36186
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.3625
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.3612
Mozilla/5.0 (X11; Linux x86_64)9
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.368
Mozilla/5.0 (compatible; Infrawatch/1.0; +https://infrawat.ch/)4
curl/7.68.03
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.363
Mozilla/5.0 (SecurityScanner/1.0)2
Mozilla/5.0 (X11; Debian; Linux x86_64; rv:145.0) Gecko/20100101 Firefox/145.02

Country

fingerprintco-occurrences
US · United States220
DE · Germany28
NL · Netherlands16
GB · United Kingdom11
CH · Switzerland2
ES · Spain2
TW · Taiwan2
AU · Australia1

Network (ASN)

fingerprintco-occurrences
AS46635 · AviationAI115
AS132817 · DZCRD Networks Ltd25
AS215373 · Sabiedriba ar ierobezotu atbildibu DELSKA Latvia25
AS210906 · UAB Bite Lietuva23
AS3257 · GTT Communications Inc.22
AS396982 · Google LLC19
AS212238 · Datacamp Limited19
AS206264 · Amarutu Technology Ltd10
AS212286 · LonConnect Ltd7
AS215540 · GLOBAL CONNECTIVITY SOLUTIONS LLP4

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
q13d0314h3_55b375c5d22e_1ecea7cb6ec11