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The iptables man page says:

Using icmp-admin-prohibited with kernels that do not support it will result in a plain DROP instead of REJECT

I have been unsuccessful at finding out at which kernel version this became supported. Does anyone know?

FWIW, the server I am interested in is running:

2.6.18-409.el5 #1 SMP Fri Feb 12 06:37:28 EST 2016 x86_64 x86_64 x86_64 GNU/Linux

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A look through one of the online kernel source browsers suggests it was supported in 2.4.37 at least, as this netfilter code seems to be implementing this reject.

It seems the info was added to the iptables man pages in may 2003.

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