54.81.163.254 resolves to:
Array
(
    [known] => true
    [countryid] => 254
    [country] => United States
    [fips104] => US
    [iso2] => US
    [iso3] => USA
    [ison] => 840
    [internet] => US
    [capital] => Washington, DC 
    [mapreference] => North America 
    [nationalitysingular] => American
    [nationalityplural] => Americans
    [currency] => US Dollar
    [currencycode] => USD
    [population] => 278058881
    [countrytitle] => The United States
    [regionid] => 142
    [region] => Maryland
    [regioncode] => MD
    [adm1code] =>     
    [cityid] => 8907
    [city] => Annapolis
    [latitude] => 38.9863
    [longitude] => -76.5083
    [timezone] => -05:00
    [locationcode] => USMDANNA
    [dma] => 512
    [certainty] => 30
    [isproxynetwork] => false
    [mapbytesremaining] => Free
)
REMOTE_ADDR resolves to:
54.81.163.254
HTTP_GEOBYTESIPADDRESS resolves to:
54.81.163.254
HTTP_GEOBYTESLOCATIONCODE resolves to:
USMDANNA
There is an explaination of how this works here: http://forums.geobytes.com/viewtopic.php?f=28&t=462