TCP SYN (p0f)

4:43+21:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 10:32 · last seen 2026-08-29 01:13 · JSON

Distinct clients per day (last 30 days, peak 1/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 TTL43+21
Options length0
MSS1460
Window sizemss*44
Window scale10
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
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.14
t13d1114h2_5e2a75874763_89e9e4bb34192
t13d311100_e8f1e7e78f70_d41ae481755e Match?Exact match in Thumbprint's published controlled catalog captures: rust-hyper 1.11.0, rust-hyper 1.11.1, rust-hyper 1.10.1.The fingerprint page shows the full measured match list. More on the catalog.2
t13d1411h2_cbb2034c60b8_e7c2852226512
t13d3112h2_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1616h2_86a278354501_0c27189014cf Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.6, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr10enus_b3034183f430_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +21 more.The fingerprint page shows the full measured match list. More on the catalog.15
ge20nn030000_ff50983941c1_000000000000_0000000000002
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn050000_ea6f06182064_000000000000_0000000000001
ge11nn06enus_98e697c2fa06_000000000000_0000000000001
ge20nn03en00_e01356d67f74_000000000000_0000000000001
ge20nn03en00_88df97815551_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog.3
4:16777216|16711681|0|m,p,a,s2
2:0;4:4194304;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:131072;5:16384|12517377|19:0:0:22|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|9:0:0:22|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|17:0:0:22|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|25:0:0:22|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|11:0:0:22|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|7:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 155.0, firefox 154.0, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1
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

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_1022

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.015
ethicrawl/0.1 (Ethical crawler respecting robots and AI directives; http://ethicrawl.ai/crawler; contact@ethicrawl.ai)2
PipericBot/1.0 (+https://piperic.com/bot)2
curl/8.5.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 f1tym1-discovery/2.01
f1tym1-scraper/1.0 (+https://f1tym1.com/sources/)1

Country

fingerprintco-occurrences
IE · Ireland16
DE · Germany2
US · United States2
FR · France2

Network (ASN)

fingerprintco-occurrences
AS5466 · Eircom Limited16
AS24940 · Hetzner Online GmbH2
AS16276 · OVH SAS2
AS10796 · Charter Communications Inc2

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
q13d0315h3_55b375c5d22e_dc5437974b471