On Apr 16, 2018, at 10:39 AM, Dan <dcrutc...@loumag.com 
<mailto:dcrutc...@loumag.com>> wrote:

> Is there a utility program to resolve IP addresses — that is, to find the 
> domain name associated with the numerical IP address?

On your Mac Applications>Utilities>Network>Lookup

> If no such program, how to do it from Terminal?

lml:leelarson ~ >host www.apple.com <http://www.apple.com/>
www.apple.com <http://www.apple.com/> is an alias for www.apple.com.edgekey.net 
<http://www.apple.com.edgekey.net/>.
www.apple.com.edgekey.net <http://www.apple.com.edgekey.net/> is an alias for 
www.apple.com.edgekey.net.globalredir.akadns.net 
<http://www.apple.com.edgekey.net.globalredir.akadns.net/>.
www.apple.com.edgekey.net.globalredir.akadns.net 
<http://www.apple.com.edgekey.net.globalredir.akadns.net/> is an alias for 
e6858.dsce9.akamaiedge.net <http://e6858.dsce9.akamaiedge.net/>.
e6858.dsce9.akamaiedge.net <http://e6858.dsce9.akamaiedge.net/> has address 
23.79.200.49
e6858.dsce9.akamaiedge.net <http://e6858.dsce9.akamaiedge.net/> has IPv6 
address 2600:1407:10:290::1aca
e6858.dsce9.akamaiedge.net <http://e6858.dsce9.akamaiedge.net/> has IPv6 
address 2600:1407:10:2a0::1aca

lml:leelarson ~ >nslookup www.apple.com <http://www.apple.com/>
Server:         9.9.9.9
Address:        9.9.9.9#53

Non-authoritative answer:
www.apple.com <http://www.apple.com/>   canonical name = 
www.apple.com.edgekey.net.
www.apple.com.edgekey.net <http://www.apple.com.edgekey.net/>   canonical name 
= www.apple.com.edgekey.net.globalredir.akadns.net.
www.apple.com.edgekey.net.globalredir.akadns.net 
<http://www.apple.com.edgekey.net.globalredir.akadns.net/>     canonical name = 
e6858.dsce9.akamaiedge.net.
Name:   e6858.dsce9.akamaiedge.net <http://e6858.dsce9.akamaiedge.net/>
Address: 23.79.200.49

L^2

---
Lee Larson
leelar...@me.com <mailto:leelar...@me.com>

‌‌
‌I hate to advocate drugs, alcohol, violence, or insanity to anyone, but 
they've always worked for me. — ‌Hunter S. Thompson,

‌‌

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