IP Addresses/Range for maps.google.com?

Hello,
We need to open our corporate firewall up to allow our application to
send geocoding web service requests to maps.google.com. To do this
we need the IP addresses or range of IPs that Google uses for this
domain. Is this information provided anywhere?

Using a simple nslookup we get the "non-authoritative" list of IPs as:
209.85.225.104
209.85.225.105
209.85.225.106
209.85.225.147
209.85.225.99
209.85.225.103

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