{"id":82195,"date":"2025-09-08T17:08:07","date_gmt":"2025-09-08T16:08:07","guid":{"rendered":"https:\/\/proxidize.com\/?post_type=blog&p=82195"},"modified":"2025-10-02T11:41:26","modified_gmt":"2025-10-02T10:41:26","slug":"what-is-proxy-hostname","status":"publish","type":"blog","link":"https:\/\/proxidize.com\/blog\/what-is-proxy-hostname\/","title":{"rendered":"What is a Proxy Hostname?"},"content":{"rendered":"\n

Proxy hostnames are IP addresses that are used to access the proxy server itself<\/strong>. They consist of two parts, namely the domain name and the port<\/strong>. Some hostnames do not have ports as they are included by default based on the protocol being used.<\/p>\n\n\n\n

While it may be simpler to just use an IP address<\/a> instead of going through a hostname, there is value in accessing a server through the hostname. This article aims to explain what a proxy hostname is, how different protocols use the hostname, and why proxy providers prefer you access proxies through the hostname.<\/p>\n\n\n\n

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Proxy Hostnames Explained<\/h2>\n\n\n\n

A proxy hostname is an alternative to an IP address<\/strong> as it is the domain name portion of it. When connecting to a proxy, users can either connect through a proxy IP or a hostname<\/strong>. The hostname consists of two parts: the domain (or IP address) and the port.<\/p>\n\n\n\n

An example of how a hostname could look like is: username:password@my-proxy:5000<\/strong>. In this instance, my-proxy is the domain name<\/strong> that, when using a DNS provider, will resolve to an IP address. You could use an IP address to bypass this but you will eventually hit the public endpoint which may be the server or a load balancer.<\/p>\n\n\n\n

The domain name is just a human-readable way to interact with the target service<\/strong>, which in this case is the proxy server<\/a>. 5000 is the port<\/strong> which, simply put, is the specific exit on the highway of the proxy server. If my-proxy resolves to a 1.2.3.4, then you can use 1.2.3.4:5000 to connect to the same proxy. <\/p>\n\n\n\n

A hostname hides the actual infrastructure of the proxy server from you. What this means is that a hostname allows proxy providers to upgrade, move, or reassign their servers without altering your access<\/strong> at all. They can apply SSL\/TLS certificates<\/a> (https:\/\/proxy.example.com) for encrypted tunneling. A hostname can resolve to multiple IPs, making sure you are always connected and that any changes from the backend will not affect you.<\/p>\n\n\n\n

Proxy hostnames can also distribute traffic across multiple servers through the practice of load balancing<\/a>, can automatically reroute you if one proxy node goes down, and provide you with a more reliable connection without manual intervention. <\/p>\n\n\n\n

Proxy hostnames are made of labels separated by commas<\/strong>, such as proxy, example, and com. Each label must be letters, numbers, or a dash<\/strong>. Each part cannot be longer than 63 characters while the entire hostname cannot exceed 253 characters<\/strong>. The RFC 1123<\/a> established that the hostname does not need to start with a letter and can start with numbers. Underscores are also invalid within hostnames, although they do appear in some DNS record types such as SRV. <\/p>\n\n\n\n

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Proxy Hostnames and Different Protocols<\/h2>\n\n\n\n

Proxy hostnames work differently depending on the protocol. For HTTP proxies<\/a>, you connect with the hostname and the proxy will either fetch the page for you or make a tunnel. More specifically, for HTTP, you send the full URL in the request line to the proxy. For end-to-end TLS or HTTPS, you use the CONNECT method to ask the proxy to open a TCP tunnel to target-host:port<\/a>. If you secure the hop to the (HTTP) proxy, the client will validate the proxy\u2019s TLS certificate against the proxy hostname or else the verification will fail. cURL documents<\/a> this explicitly through CURLOPT_PROXY_SSL_VERIFYHOST.<\/p>\n\n\n\n

For SOCKS5 proxies<\/a>, the sever will resolve domains for you, removing the need for a local DNS. SOCKS5 supports an \u201caddress type = DOMAINNAME\u201d so you can send the target domain to the proxy and let the proxy handle DNS resolution. This is why schemes like socks5h:\/\/ in clients means \u201cresolve hostnames through the proxy\u201d.<\/p>\n\n\n\n

Applications and tools such as cURL<\/a>, Python Requests, Git, and npm, let you plug in a proxy hostname directly. cURL supports both -x<\/code> or \u2013proxy<\/code> to set up a proxy<\/strong>. An example of this would be curl -x http:\/\/user:pass@proxy.example.com:8080 http:\/\/example.org<\/code><\/strong>. This works with HTTP, HTTPS, and SOCKS5 protocols. With HTTP proxies, it will verify the hostname against the TLS certificate<\/strong>. Python will use a proxy dictionary to specify the hostnames<\/strong>. This will look something like this:<\/p>\n\n\n\n

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