http://eset.update-server.nethttp://nod32.update-server.orghttp://eset-mirror.netYes. All listed servers are owned and operated by ESET, spol. s r.o. They are not "cracked" or "pirate" servers. They are legitimate content delivery networks (CDNs) that ESET provides for global distribution.
Your antivirus is only as good as its latest signature update. One corrupted update from a rogue server could expose your entire system to ransomware. Do not risk your security to save a few dollars. eset nod32 update server list free