问题
I am calling ipinfodb via JS. Recently I have had around 5-6 responses (from around 600) that specify the countryCode as 'RD'.
'RD' isn't a ccTLD and I cannot find any reason for this to be returned. Has anybody had a similar issue and did you find a fix?
I am calling ipinfodb on the route
http://api.ipinfodb.com/v3/ip-country/?key=_apikey_&ip=_ip_
回答1:
RD is returned as a pseudo-country code for reserved IP addresses.
This includes things like private addresses, class D and E networks (IPv4) and loopback.
For a complete list of addresses that will return this value, see here.
I can't actually find this behaviour documented anywhere, but experimentation easily demonstrates that this is the case, and moreover the <CountryName> element is populated with the word "Reserved" in these cases.
回答2:
RD is a short country code for "RESERVED" IP address range. It is a range reserved for certain networking purpose as approved by IETF.
This code is only used in IPInfoDB version 2 which has been deprecated.
You should upgrade to latest version 3 API which is constantly updated.
In v3, you will only see "-" in the country code results to avoid this confusion.
来源：https://stackoverflow.com/questions/13691815/ipinfodb-lookup-returns-countrycode-rd