TCP SYN (p0f)

4:110+18:0:1400:mss*44,8:mss,nop,ws,nop,nop,sok::0

first seen 2026-08-27 15:35 · last seen 2026-10-15 09:32 · 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 TTL110+18
Options length0
MSS1400
Window sizemss*44
Window scale8
Options layoutmss,nop,ws,nop,nop,sok
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
t13d2913h1_723694b0fccc_5671b5df50292
t13d2013h1_2b729b4bf6f3_e24568c0d4401
t13d1713h1_5b57614c22b0_6a3d802a71391

HTTP request (JA4H)

fingerprintco-occurrences
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
ge11nn08enus_0e9bd3873e9d_000000000000_0000000000001
ge11nr11bgbg_835281d8e5d9_000000000000_0000000000001
ge11nn11bgbg_b350a6a7c155_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-1-3-1-1-4_1400_84

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (iPhone; CPU iPhone OS 17_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Mobile/15E148 Safari/604.12
curl/8.18.01
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; OpenCode-User/1.0; +https://opencode.ai1

Country

fingerprintco-occurrences
BG · Bulgaria2
JP · Japan1
HK · Hong Kong SAR China1

Network (ASN)

fingerprintco-occurrences
AS8866 · Vivacom Bulgaria EAD2
AS2527 · Sony Network Communications Inc.1
AS58453 · China Mobile International Limited1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1