I have 5 ASA5505 connecting to a ASA5510. When creating the crypto map and tunnel-group on the ASA 5505's can I reference a DNS name instead of an IP address?
Yes you can. You'll need to set up a DNS server group with your dns servers, and you'll need to configure domain lookup.
DNS server-group MYDNS
In your crypto map:
crypto map 1 set peer my.vpn.com
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