--- title: Using netcat for a Simple Connectivity Test | daily.dev description: A quick reference for using netcat (`nc`) to test network connectivity between two hosts. Start a listener with `nc -l -p 9999` and connect to it with `nc... canonical: https://daily.dev/posts/using-netcat-for-a-simple-connectivity-test-pxf9xqnbd twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Using netcat for a Simple Connectivity Test | daily.dev og:description: A quick reference for using netcat (`nc`) to test network connectivity between two hosts. Start a listener with `nc -l -p 9999` and connect to it with `nc... og:url: https://daily.dev/posts/using-netcat-for-a-simple-connectivity-test-pxf9xqnbd og:image: https://api.daily.dev/og/posts/pxf9xQNBD.png og:image:alt: Using netcat for a Simple Connectivity Test og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Using netcat for a Simple Connectivity Test **[No Dogma Blog \(Bryan Hogan\)](https://daily.dev/sources/bryanhogan)** · 1 min read · 3 upvotes · 0 comments ## Summary A quick reference for using netcat (`nc`) to test network connectivity between two hosts. Start a listener with `nc -l -p 9999` and connect to it with `nc 9999`. Works with Docker Compose container names as hostnames or localhost for same-host testing. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Linux Fu: UPNP A Port Mapping Odyssey](https://daily.dev/posts/linux-fu-upnp-a-port-mapping-odyssey-elhoupfc4) · Hackaday · 0 upvotes · 0 comments --- Tags: [#docker](https://daily.dev/tags/docker), [#networking](https://daily.dev/tags/networking) [View this post on daily.dev](https://daily.dev/posts/using-netcat-for-a-simple-connectivity-test-pxf9xqnbd) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Using netcat for a Simple Connectivity Test","url":"https://daily.dev/posts/using-netcat-for-a-simple-connectivity-test-pxf9xqnbd","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/using-netcat-for-a-simple-connectivity-test-pxf9xqnbd"},"datePublished":"2026-07-02T21:10:27.562Z","dateModified":"2026-07-02T21:11:32.969Z","description":"A quick reference for using netcat (`nc`) to test network connectivity between two hosts. Start a listener with `nc -l -p 9999` and connect to it with `nc...","image":"https://media.daily.dev/image/upload/s--foaA6JGU--/f_auto/v1722860399/public/Placeholder%2004","thumbnailUrl":"https://media.daily.dev/image/upload/s--foaA6JGU--/f_auto/v1722860399/public/Placeholder%2004","isAccessibleForFree":true,"articleSection":"No Dogma Blog (Bryan Hogan)","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"No Dogma Blog (Bryan Hogan)","logo":"https://media.daily.dev/image/upload/s--0RnGeoPG--/f_auto,q_auto/v1780213499/logos/bryanhogan?_a=BAMAMiWQ0","url":"https://daily.dev/sources/bryanhogan"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/using-netcat-for-a-simple-connectivity-test-pxf9xqnbd","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":3},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"docker,networking","timeRequired":"PT1M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"No Dogma Blog (Bryan Hogan)","item":"https://daily.dev/sources/bryanhogan"},{"@type":"ListItem","position":3,"name":"Using netcat for a Simple Connectivity Test"}]} ```