54.163.84.123 resolves to:
Array
(
    [known] => true
    [countryid] => 253
    [country] => United Kingdom
    [fips104] => UK
    [iso2] => GB
    [iso3] => GBR
    [ison] => 826
    [internet] => UK
    [capital] => London 
    [mapreference] => Europe 
    [nationalitysingular] => British
    [nationalityplural] => Britons
    [currency] => Pound Sterling
    [currencycode] => GBP
    [population] => 59647790
    [countrytitle] => The United Kingdom
    [regionid] => 5392
    [region] => England
    [regioncode] => EN
    [adm1code] =>     
    [cityid] => 12008
    [city] => London
    [latitude] => 51.5170
    [longitude] => -0.1050
    [timezone] => +00:00
    [locationcode] => UKENLOND
    [dma] => 
    [certainty] => 45
    [isproxynetwork] => false
    [mapbytesremaining] => Free
)
REMOTE_ADDR resolves to:
54.163.84.123
HTTP_GEOBYTESIPADDRESS resolves to:
54.163.84.123
HTTP_GEOBYTESLOCATIONCODE resolves to:
UKENLOND
There is an explaination of how this works here: http://forums.geobytes.com/viewtopic.php?f=28&t=462