Check an IP address or a website against spam databases and the Roskomnadzor registry.
An IP can land in blacklists (DNSBL) for sending spam or being compromised — hurting its mail deliverability and reputation. A site can be added to the Roskomnadzor (RKN) registry and blocked by Russian ISPs.
If a site is blocked, GANVAS VPN restores access through a server in another country. See also how to bypass blocks.
The site is in the RKN registry and may be unavailable on Russian ISPs. A VPN restores access via a server in another country.
If it's your server, check it for compromise and spam, then request delisting from the database. For a home IP, listings are usually temporary.
Related guides: Why you need a VPN · How to bypass blocks · What is a DNS leak · How to encrypt your traffic
The app: WireGuard config · VLESS client · Tor VPN · VPN for Windows