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Telnet resolving names via IPv6 instead of ipv4

If I ping tools.cisco.com it is successful via ipv4:

ROUTER# ping tools.cisco.com
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 173.37.145.8, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 62/62/63 ms

 

But if I try to telnet to tools.cisco.com port 443 I get an ipv6 name lookup! I'm not running ipv6 anywhere on this router:

ROUTER#telnet tools.cisco.com 443
Trying 2001:420:1101:5::A, 443 ...
% Destination unreachable; gateway or host down

ROUTER#

 

What the heck is going on?

 

--<snip> --
ip name-server <my internal dns ipv4 address>
ip domain lookup source-interface Loopback0
ip domain name <my internal domain name>

http client source interface Loopback0

interface Loopback0
ip address 10.255.0.136 255.255.255.255
end

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