Barkrowler

The wire fingerprints traffic claiming to be this crawler presented, split by whether a channel the operator publishes for verification — its IP ranges or forward-confirmed reverse DNS — confirmed the claim.

Claims in window

Same adjudication as the stats page: a claim confirmed by either channel the operator publishes — its IP ranges or forward-confirmed reverse DNS — is verified; one confirmed by neither is unverified. Operators differ in which channels they offer, and either alone fully identifies. Sources count distinct clients, not traffic. Fingerprint windows below are day-granular, like sources.

observationssourcesverifiedunverifiedunverified rate
65121200.0%

Fingerprints presented by confirmed traffic

The highest-volume fingerprints the operator's own traffic runs, per signal — claims confirmed via operator-published channels. A Match pill marks an exact match against a controlled capture — an association with known stacks, not an identity verdict: unrelated clients built on the same stack can legitimately share a fingerprint.

TLS ClientHello (JA4)

fingerprintobservations
t13d491200_bd868743f55c_7c76daad20ec Match?Exact match in Thumbprint's published controlled catalog captures: java-urlconnection 17.0.12.The fingerprint page shows the full measured match list. More on the catalog. 65

HTTP request (JA4H)

fingerprintobservations
ge11nn070000_cfd688ca49e2_000000000000_000000000000 62
ge11nn060000_9078d5dd083b_000000000000_000000000000 3

TCP SYN (JA4T)

fingerprintobservations
64240_2-4-8-1-3_1460_8 65

TCP SYN (p0f)

fingerprintobservations
4:53+11:0:1460:mss*44,8:mss,sok,ts,nop,ws:df,id+:0 65