User-Agent

DuckAssistBot/1.2; (+http://duckduckgo.com/duckassistbot.html)

first seen 2026-07-18 17:59 · last seen 2026-10-31 10:51 · 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 verified; one confirmed by neither — outside the ranges, inside a different operator's, or failing the DNS check — is unverified. Meta publishes its network rather than crawler ranges, so its verified claims are network-confirmed and its unconfirmed misses are unverified claims, not proven spoofs. Telegram publishes network ranges rather than fetcher ranges, and its misses are treated the same way. bot-claim anomalies →

claims	verified	unverified	unverified rate
DuckAssistBot	26	0	0.0%

Last 7 days (7 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	`DuckAssistBot 1.2`
Device class	`bot`
Declared URL	`http://duckduckgo.com/duckassistbot.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.	22
`t13d1312h2_f57a46bbacb6_ab7e3b40a677` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.10, go-net/http 1.26.9, +7 more.The fingerprint page shows the full measured match list. More on the catalog.	4

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn080000_f57775ada363_000000000000_000000000000`	18
`ge11nr080000_f57775ada363_000000000000_000000000000`	4
`ge20nn060000_421494bd28b0_000000000000_000000000000`	2
`ge20nn060000_60983739d474_000000000000_000000000000`	1
`ge20nn060000_f961c74b181b_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 1.26.10, go-net/http 1.26.9, +8 more.The fingerprint page shows the full measured match list. More on the catalog.	4

TCP SYN (p0f)

fingerprint	co-occurrences
`4:46+18:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	9
`4:45+19:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	4
`4:47+17:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0`	4
`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
`4:40+24:0:1440: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`	26

Country

fingerprint	co-occurrences
`US` · United States	23
`SG` · Singapore	2
`BR` · Brazil	1

Network (ASN)

fingerprint	co-occurrences
`AS8075` · Microsoft Corporation	26

TLS supported groups

fingerprint	co-occurrences
`11ec,11eb,11ed,001d,0017,0018,0019` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.3, go-net/http 1.26.10.The fingerprint page shows the full measured match list. More on the catalog.	10