User-Agent

DuckDuckBot/1.1; (+http://duckduckgo.com/duckduckbot.html)

first seen 2026-06-18 12:53 · last seen 2026-09-14 20:27 · JSON

Bot verification

This User-Agent declares a bot or user-triggered fetcher. Each connection's IP is checked at ingest against the verification channels the operator publishes — its crawler IP ranges and, where documented, forward-confirmed reverse DNS. A claim either channel confirms is identified; one confirmed by neither — outside the ranges, inside a different operator's, or failing the DNS check — is an impersonation signal. Meta publishes its network rather than crawler ranges, so its identified claims are network-confirmed and its unconfirmed misses are unverified claims, not proven spoofs. bot-claim anomalies →

claims	identified	unconfirmed miss	wrong operator	unconfirmed rate
DuckDuckBot	66	0	0	0.0%

Last 7 days (2 observations)

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

Browser / client	`DuckDuckBot 1.1`
Device class	`bot`
Declared URL	`http://duckduckgo.com/duckduckbot.html`
Note	`inferred from the self-declared string — a claim, not a measurement; compare with the wire fingerprints above`

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
`t13d131100_f57a46bbacb6_ab7e3b40a677` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.	85

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nr09enus_ac151016e6e5_000000000000_000000000000`	46
`ge11nr05enus_813e32c09d15_000000000000_000000000000`	19
`ge11nr06enus_a89d28968959_000000000000_000000000000`	11
`ge11nr06enus_34bb3a836f3b_000000000000_000000000000`	9

TCP SYN (p0f)

fingerprint	co-occurrences
`4:44+20:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	31
`4:43+21:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	21
`4:46+18:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	20
`4:45+19:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	9
`4:47+17:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	2
`4:51+13:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	1
`4:49+15:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`42340_2-4-8-1-3_1440_7`	54

Country

fingerprint	co-occurrences
`IE` · Ireland	49
`US` · United States	36

Network (ASN)

fingerprint	co-occurrences
`AS8075` · Microsoft Corporation	85