From owner-freebsd-ipfw@freebsd.org  Mon Aug  3 09:38:34 2015
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To: "freebsd-ipfw@freebsd.org" <Freebsd-ipfw@freebsd.org>
From: Julian Elischer <julian@elischer.org>
Subject: ipfw delete 100-300
Message-ID: <55BF368A.60004@elischer.org>
Date: Mon, 3 Aug 2015 17:38:18 +0800
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my reading of the code I can see that 'ipfw delete 100-300' doesn't
work (well I know it doesn't work, but I had thought it was a bug),
Now I see that its just 'not supported'

It may be my imagination but (distant) past?