Can you secure a website with an SSL certificate using an IP address? The answer is a resounding ‘Yes!’
It is indeed possible to obtain an SSL certificate for a public IP address, opening up new possibilities for your online security. Below, we outline the key guidelines and prerequisites for acquiring an SSL certificate for an IP address:

• SSL Certification is available for Public IP Addresses only
  Rest assured, SSL certificates are available only for public IP addresses. This offers a flexible way to enhance your online security while broadening your digital horizons.

• Control of the IP Address
  To qualify, your organization must have control over the specific IP address in question. Demonstrating your command over the IP address is vital to the validation process.

• Verification through File Authentication
  The Certification Authority (CA) will require verification of your IP address control via file authentication. This entails uploading a designated file that must be freely accessible over HTTP or HTTPS, showcasing your authority.
  An example URL would be:
  1.1.1.1/.well-known/pki-validation/fileauth.txt
  Validation using email or DNS methods is not allowed for IPs: these methods are available only for hostnames.

• Full IP Address Control
  Ensure you have complete control over the entire IP address. It’s important to remember that control should extend beyond any port to meet the SSL certificate issuance criteria.

• Flexible Placement in the multi-domain Certificate
  When opting for a multi-domain SSL, you have the flexibility to include the IP address in either the Common Name (CN) field or the Subject Alternative Name (SAN) field.

• Limitations on IP Address Types
  While public IP addresses are eligible, certain IP address categories are not suitable for SSL certificates. Reserved IP addresses (such as those within RFC 1918 and RFC 4193 ranges), private IP addresses (both IPv4 and IPv6), and internal server names used in intranets or local server names with non-public domain name suffixes cannot be covered by an SSL certificate.

• Exclusions for Extended Validation (EV) SSL
  It’s important to note that Extended Validation (EV) SSL certificates cannot be issued for IP addresses. These certificates come with stricter validation criteria and are reserved for domain names only.
  
  
• No wildcard certificates
  It’s not possible to get a wildcard certificate to cover one or more public IPs.
  If you need to cover more than one IP, you need a single-domain certificate for each IP, or a multi-domain certificate, using a SAN for each IP.
  
  
• How to compile CSR for an IP?
  You just would set the required IP as the common name; all other required fields can be set as usual.
  

What SSL Certificates are suggested to cover IPs?

Any non-wildcard DV or OV certificate could be suitable for covering an IP.
Based on our experience, we recommend the following:

Single Domain DV SSL Certificates
Following DV certificates are ideal choices for securing your IP address, offering a hassle-free path to enhancing your online security without the complexities associated with more advanced certificate types.

• RapidSSL Single Domain SSL Certificate
  RapidSSL certificates provide essential encryption for your IP address, ensuring data security and privacy. With a swift issuance process, RapidSSL offers a cost-effective solution to safeguard your online presence.

• GeoTrust QuickSSL Premium
  The GeoTrust QuickSSL Premium certificate offers swift validation and robust encryption for your IP address. Its established reputation for reliability and affordability makes it an excellent choice for bolstering your website’s security.

• Comodo Essential SSL
  The Comodo Essential SSL certificate provides a solid layer of encryption for your IP address. Known for its user-friendly process, this certificate offers cost-effective security without compromising on quality.

Single Domain SSL OV Certificates

When the need arises to secure an IP address with an elevated level of validation, consider these reputable OV certificates that offer robust protection. By opting for these certificates, you’re not only encrypting your IP but also demonstrating your commitment to credibility and security.
Here are the suggested certificates for ensuring the security and credibility of your IP:

• Comodo InstantSSL Premium
  The Comodo InstantSSL Premium certificate stands as a strong choice for IP security with organization validation (OV). It not only encrypts your IP address but also verifies the legitimacy of your organization, instilling confidence in visitors.

• Thawte SSL Web Server
  For businesses seeking the trustworthiness of OV validation, the Thawte SSL Web Server certificate is a recommended option. With this certificate, you’re not only safeguarding your IP but also providing your users with the assurance that your identity has been verified.

• GeoTrust True BusinessID
  The GeoTrust True BusinessID certificate adds an extra layer of validation to your IP security. As an OV certificate, it authenticates your organization, ensuring that your IP address is backed by a trustworthy entity.

Multi-Domain SSL Certificates

When aiming to secure multiple IP addresses (or hostnames) with a versatile multi-domain certificate, several reliable options cater to diverse security needs.
Embrace the flexibility of multi-domain certificates to safeguard multiple IP addresses. Whether you opt for the simplicity of DV, the validation depth of OV, or the top-notch security of DigiCert, you’re assured of a reliable solution to cover your diverse IP security needs.
Here are the suggested certificates for comprehensive protection:

• PositiveSSL Multi-Domain (DV)
  The PositiveSSL Multi-Domain certificate is an excellent choice for securing multiple IP addresses. Offering rapid issuance and affordable pricing, it’s an optimal solution for websites requiring hassle-free encryption across different IPs.

• GeoTrust True BusinessID Multi-Domain (OV)
  For businesses seeking enhanced validation along with multi-IP security, the GeoTrust True BusinessID Multi-Domain certificate fits the bill. With organization validation (OV) and reliable encryption, it instils trust in your digital presence across various IPs.

• DigiCert Multi-Domain SSL
  The DigiCert Multi-Domain SSL certificate provides robust security for a multitude of IP addresses. Known for its stringent validation process and top-tier encryption, it’s a preferred choice for businesses prioritizing security and credibility.