TCP SYN (p0f)
4:37+27:0:1380:65535,6:mss,sok,ts,nop,ws:df,id+:0
first seen 2026-07-26 12:18 · last seen 2026-10-21 20:15 · JSON
Distinct clients per day (last 30 days, peak 2/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 version | 4 |
|---|---|
| Initial TTL | 37+27 |
| Options length | 0 |
| MSS | 1380 |
| Window size | 65535 |
| Window scale | 6 |
| Options layout | mss,sok,ts,nop,ws |
| Quirks | df,id+ |
| Payload class | 0 |
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)
| fingerprint | co-occurrences |
|---|---|
t13d4312h1_c7886603b240_b26ce05bbdd6 | 4 |
t13d4412h1_fd39b124ee10_58ed7828516f | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog. | 5 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
65535_2-4-8-1-3_1380_6 | 5 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
KE · Kenya | 3 |
NG · Nigeria | 2 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS33771 · Safaricom Limited | 2 |
AS29465 · MTN NIGERIA Communication limited | 2 |
AS37129 · Rasmilink | 1 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
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. | 4 |