Returns the physical address associated with this as a string.
(Eg, "127.0.0.1"). If the address is not yet known, returns null.
This method is not thread-safe; if you call it while this is being resolved in another thread, it may return garbage. You can use is_resolved to safely test whether or not an address is resolved before fetching its name or address.
| this |
a Address |
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the physical address, or |