How to add many IPV6 ips ? Adding rc.conf aliases just hangs server

What is the proper way to enable FreeBSD to listen on lets say 4000 IPv6?
Adding 4000 them at rc.conf as ifconfig_igb0_aliasXXXX=... " just hangs my server after /etc/netstart
All ip's are from 1 subnet but they are not sequential .
 
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