BIND and 127.0.0.1 clients

[Klunk]

Can anyone shed some light on why I am seeing occasional lookups like 
these? (the key is the client is 127.0.0.1 - localhost)

27-Sep-2008 5:56:55.851 client 127.0.0.1#3068: query: 1.0.0.127.in-
addr.arpa IN PTR +
27-Sep-2008 5:56:55.851 client 127.0.0.1#3069: query: gmx.us IN A +
27-Sep-2008 5:56:56.242 client 127.0.0.1#3070: query: 1.0.0.127.in-
addr.arpa IN PTR +
27-Sep-2008 5:56:56.242 client 127.0.0.1#3071: query: gmx.us IN MX +

AFAIAA I don't have any clients running on the box that would address the 
DNS server at a local host level - they are all seen connecting by their 
respective IP addresses. My googles on this, as you can imagine, have not 
given much use with a search string like '127.0.0.1' :-)

It's a few every day, always the same lookups, differing times.

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