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. Agent Analytics can track when it visits your website.
Category
Expected Behavior
DLC's traffic is as regular as a cron job, because it usually is one. Uptime monitors hit the same endpoint every few minutes, while performance and audit tools run deeper scans on demand. Expect narrow, repetitive access to specific pages rather than crawling.
Overview
| Operated By | Dr. Link Check |
| Expected To Follow Robots.txt | No |
| Insights Last Updated | July 6, 2026 |
Robots.txt Blocked Percentage
Country of Origin
Robots.txt Blocking Trend
As of July 6, 2026, 0% of top websites block DLC in their robots.txt files.
Overall Developer Helper Traffic
As of July 6, 2026, 0.6% of all web traffic came from developer helpers.
This data reflects agent visits measured across thousands of websites using Agent Analytics, combined with daily scans of the world's top 1000 websites and their robots.txt files.
DLC's User Agent
| 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}} |
Access other known user agents and IP addresses using the Enterprise API.
How To Block DLC
Add this rule to your robots.txt file to request that DLC not access your website. You can customize which pages are blocked by swapping out / for a different path.
User-agent: DLC # https://knownagents.com/agents/dlc
Disallow: /Frequently Asked Questions
Should I Block DLC?
Only if nobody you work with uses it. DLC is the kind of tool a team points at its own site for uptime checks, performance tests, and audits. If someone on your team relies on it, blocking it silently breaks their monitoring. Almost none of the top websites we track have robots.txt rules for DLC right now.
Does DLC Respect Robots.txt?
No. DLC is not expected to honor robots.txt, so a disallow rule only states your preference. Enforce the block with firewall or server rules, then confirm in Agent Analytics that its requests actually stop.
Does DLC Access Private Content?
Only if its owner sets that up. Monitoring tools check whatever they are configured to check, which can include staging sites and private health endpoints when a team grants access. Uninvited, DLC sees only public pages.
Why Is DLC Visiting My Website?
Someone pointed DLC at your site, most likely your own team. Uptime monitors, performance testers, and audit tools only visit the sites they are configured to watch.
How Can I Tell if DLC Is Visiting My Website?
Agent Analytics tracks DLC visits in real time alongside every other known AI agent, crawler, and scraper. You can also check your server logs for requests whose user agent string contains "DLC". Look for regular checks of the same pages or endpoints, often minutes apart. Keep in mind that DLC doesn't publish a verification method, so any client can claim its user agent string and a log match is a hint rather than proof.