Private use of non-RFC1918 IP space

Paul Stewart pstewart at
Mon Feb 2 15:51:58 UTC 2009

What reason could you possibly have to use non RFC 1918 space on a
closed network?  It's very bad practice - unfortunately I do see it done


-----Original Message-----
From: Trey Darley [mailto:trey at] 
Sent: February 2, 2009 10:48 AM
To: nanog at
Subject: Private use of non-RFC1918 IP space

Hi, y'all -

Some colleagues and I are running into a bit of a problem. We've been
using RFC 1918 Class A space but due to the way subnets have been
allocated we are pondering the use of public IP space. As the network in
question is strictly closed I don't anticipate any problems with this as
the addresses would be unambiguous within our environment. I'm curious
anyone else is doing this.

I'd be very interested in corresponding off-list with anyone who's in a
similar position.

Kingfisher Operations
Trey Darley - Principal



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