dblink does not resolve DNS, but works with IP

If I have this:

CREATE OR REPLACE VIEW Link.Foo AS
select * from dblink(
'hostaddr=123.123.123.123 dbname=KitchenPC user=Website
password=secret',
'select * from Foo') as ...

Then it works. However, if I do:

CREATE OR REPLACE VIEW Link.Foo AS
select * from dblink(
'hostaddr=db.domain.com dbname=KitchenPC user=Website password=secret',
'select * from Foo') as ...

Then I get:

ERROR: could not establish connection
DETAIL: could not translate host name "db.domain.com" to address: Unknown
host

However, from a command prompt I can ping db.domain.com and get
123.123.123.123.

Does dblink just not support DNS resolution? I really don't want to hard
code IP addresses in my scripts. Thanks!