User-Agent

DuckDuckBot/1.0; (+http://duckduckgo.com/duckduckbot.html)

first seen 2026-07-22 18:41 · last seen 2026-09-14 13:18 · 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	14	0	0	0.0%

Last 7 days (2 observations)

Distinct clients per day (last 30 days, peak 3/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 1.0`
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
`t13d1312h2_f57a46bbacb6_ab7e3b40a677` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +5 more.The fingerprint page shows the full measured match list. More on the catalog.	11
`t13d1516h2_8daaf6152771_806a8c22fdea` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +24 more.The fingerprint page shows the full measured match list. More on the catalog.	3

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn030000_ff50983941c1_000000000000_000000000000`	7
`ge20nr030000_ff50983941c1_000000000000_000000000000`	3
`ge20nr030000_80b089f68b8e_000000000000_000000000000`	1
`ge20nn16enus_9a119c50b7b2_000000000000_000000000000`	1
`ge20nr15enus_73685ad2097f_000000000000_000000000000`	1
`ge20nr15enus_0c2922224a95_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`2:0;4:4194304;5:16384;6:10485760\|1073741824\|0\|a,m,p,s` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.	11
`1:65536;2:0;4:6291456;6:262144\|15663105\|1:1:0:220\|m,a,s,p` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 149.0.7827.102, +58 more.The fingerprint page shows the full measured match list. More on the catalog.	2
`1:65536;2:0;4:6291456;6:262144\|15663105\|1:1:0:256\|m,a,s,p` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +42 more.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:49+15:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	4
`4:48+16:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	4
`4:46+18:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	3
`4:45+19:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	1
`4:44+20:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	1
`4:47+17:0:1440: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`	14

Country

fingerprint	co-occurrences
`US` · United States	14

Network (ASN)

fingerprint	co-occurrences
`AS8075` · Microsoft Corporation	14