TCP SYN (p0f)

4:113+15:0:1460:8192,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

first seen 2026-06-20 00:56 · last seen 2026-10-14 04:27 · 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 TTL113+15
Options length0
MSS1460
Window size8192
Window scale8
Options layoutmss,nop,ws,nop,nop,sok
Quirksdf,id+,ecn
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
t13d131300_f57a46bbacb6_fb48f8b98a2928
t12d280800_bbd4f008d9b2_16bbda4055b24
t13d3112h1_e8f1e7e78f70_8d633dac7124 Match?Exact match in Thumbprint's published controlled catalog captures: curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.2
t12i280600_d943125447b4_e7e480e5a9971

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr04engb_8ddaef5d77af_000000000000_00000000000028
ge11nr08zhcn_5e320583bf18_000000000000_0000000000004
ge11nr15enus_21d8bfafe465_000000000000_0000000000002
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0, curl 7.88.1, curl 8.21.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
8192_2-1-3-1-1-4_1460_831

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Safari/605.1.1528
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.364
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 13_6_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3776.93 Safari/537.36 OPR/80.0.3776.931

Country

fingerprintco-occurrences
NL · Netherlands28
HK · Hong Kong SAR China4
SG · Singapore2
BG · Bulgaria1

Network (ASN)

fingerprintco-occurrences
AS213438 · ColocaTel Inc.28
AS152194 · CTG Server Limited4
AS14061 · DigitalOcean, LLC2
AS209702 · SOLDATOV ALEXEY VALEREVICH1