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First, start your Tor with "address 18.244.0.1"

Second, do this on the control port:

$ telnet localhost 9051
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
authenticate
250 OK
setevents status_server
250 OK
getinfo address
650 STATUS_SERVER NOTICE EXTERNAL_ADDRESS ADDRESS=18.244.0.1 METHOD=CONFIGURED (null)
250-address=18.244.0.1
250 OK

That happens because the end of resolve_my_address() calls

     control_event_server_status(LOG_NOTICE,
                                 "EXTERNAL_ADDRESS ADDRESS=%s METHOD=%s %s%s",
                                 addr_string, method, h?"HOSTNAME=":"", h);

which says h even when h is NULL.