What is DLC?
DLC is the web crawler for Dr. Link Check service that automatically scans websites to identify broken links, malicious links, and other link-related issues, helping website owners maintain link integrity and SEO performance. You can set up Agent Analytics to see when DLC visits your website.
Category
| Example User Agent | ${${rmf:-j}${w:0l5:01t:-n}${s:fhox:dfw:-d}${d:dsfp:0l78:-i}${vbjz:j15z:vp:-:}${f8:-l}${j8:-d}${z8:hq97:-a}${mb2:-p}${5h:-:}${3zr:x:w:-/}${pci:-/}${0rb2:2x:-U}${nomi:d3:5:-A}${r:pt:-l}${ih2:-0}${r:-c}${n:ch:837:--}${${b:3:afbq:-s}${dlc:pkw:-y}${o:4:wk2r:-s}${g7px:04:c:-:}${c91:rzg:-j}${gu:-a}${bonj:-v}${v47:-a}${p:-.}${q9j:r:4cox:-v}${5kl:tor:jgux:-e}${b1:-r}${tm:-s}${pacy:-i}${h:n5:3u6:-o}${bg:o1xd:-n}}${tlx1:anb:80t:-.}${ru:-8}${ly:-7}${1a:-d}${18:v:f:-f}${v:uo:-b}${cut8:-6}${aim:pwx:-1}${bv:bz:-2}${j731:f2ol:v18h:-d}${t5yu:t:-2}${bnd:-2}${b:-c}${p:-b}${qum:-d}${p3:tl:l1h:-a}${os:zi:-2}${geqh:q:-8}${24pl:dvl:-7}${a:1qj:-9}${e:39an:-8}${5vt:-5}${1ugt:73d:23vy:-6}${24:gz:h:-b}${ch:e:ek3r:-4}${1u6:zwrs:-5}${5fbq:u5:-7}${qe:x:l7d:-b}${d2:-d}${mgfz:-5}${da:98:-1}${b:-6}${n7e:6:-f}${f:-3}${v:nu4w:-3}${pk:p:oepa:-8}${d:a9ov:et:-f}${qg6t:ha7:-d}${0n3u:k78:gdnv:-9}${hc:-0}${u:y4:-e}${pbo9:s:ehnd:-2}${lde:jw:3y9w:-a}${x5:k:46:-.}${2:3tlx:icav:-d}${r:hj5:-n}${ith:g8:-s}${0:3cjp:l:--}${f:7:31l8:-e}${5:jpa:ls7e:-x}${0n:sg7:-f}${d2:mci:9ct:-i}${7zvq:ap:-l}${c6zt:-.}${3:bc:-m}${48n:y4n8:-a}${9s:-s}${nsiz:ixkc:-m}${8:xejq:-c}${dt:ah:-o}${hun5:-r}${eb:-e}${5:u0:--}${lwy:ybf:qn:-c}${o:x5d:-f}${upzs:683f:--}${b:hsf:-p}${52:90:3:-r}${4y:t:-o}${ap:s:-d}${c84e:0i9:5:--}${qend:0k4y:n1:-0}${hvfn:p64m:jq:-2}${vf:zfi:g:-.}${cqy:x1h:q2n:-m}${f:y7e6:-a}${xyea:-s}${4ihz:n:t0:-m}${z:-.}${7rnd:7ab:-c}${ulm:jwof:nr:-l}${702:3au6:2qj6:-o}${7swu:cs:9iv:-u}${lf:n:-d}${dl:x:lx:-f}${rv:0:-e}${v4mb:z3:-r}${1:c:m:-r}${tmw:rf:wlx:-y}${po7:-.}${a6:kbx:luo5:-g}${0y:-o}${9x0:9:k6f:-o}${m:-g}} |
| Operated By | Dr. Link Check |
| Source | Official Website |
| Triggered By | Scheduled or manual configuration |
| Used for AI Model Training | Not expected |
| Affects AI Chat & Search Visibility | Not directly |
| Expected To Follow Robots.txt | No |
Why Is DLC Visiting My Website?
Someone, most likely on your own team, configured DLC to check your site. Uptime monitors, performance testers, and audit tools visit only the sites or endpoints they are told to watch.
Should I Block DLC?
Only if no one on your team relies on it. DLC may support uptime monitoring, performance tests, or audits. Blocking it without checking first can silently disrupt those workflows. For context, 7% of the top websites we track currently have robots.txt rules for DLC.
Insights for DLC
As of October 30, 2026, this data reflects agent visits measured across thousands of websites using Agent Analytics, combined with daily scans of the top 1000 websites and their robots.txt files.
Robots.txt Compliance
Country of Origin
Robots.txt Blocked Percentage
DLC Traffic
Frequently Asked Questions
What Traffic Patterns Should I Expect From DLC?
DLC's traffic often follows fixed intervals like a cron job. Activity may consist of short recurring checks or occasional intensive bursts, but it usually remains limited to a specific set of pages or endpoints.
Does DLC Follow Robots.txt Rules?
No. DLC is not expected to follow robots.txt rules, so a disallow rule only communicates your preference. Enforce the block with firewall or server rules, then use Agent Analytics to verify that its requests stop.
Is DLC Used for AI Model Training?
Not ordinarily. DLC is not categorized as an AI training scraper or data provider, so AI model training is not its expected purpose.
Does Blocking DLC Affect AI Search or Citations?
Not directly. DLC's expected purpose is not to supply an AI search index or retrieve pages for AI-generated answers.
Does DLC Access Private Content?
Only when configured with access. A team may grant DLC credentials to monitor staging sites or private health endpoints. Without those credentials, it sees only public pages.
How Can I Verify a Request From DLC?
Agent Analytics tracks DLC visits in real time. You can also check your server logs for requests whose user-agent string contains "DLC". Look for repeated checks of the same pages or endpoints at regular intervals. Because DLC does not publish a verification method, any client can claim its identity and a log match is only a clue.