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Editorial Team
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Asked: 2026-06-18T12:07:38+00:00

How do you convert an IPv6 address into a binary representation and back? I

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How do you convert an IPv6 address into a binary representation and back?

I was only able to convert it to a number, then attempting to convert that to a string.

IPAddr.new('fe80::c')
# => #<IPAddr: IPv6:fe80:0000:0000:0000:0000:0000:0000:000c/ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff>

IPAddr.new('fe80::c').to_i
# => 338288524927261089654018896841347694604
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1 Answer

  1. Editorial Team

    As @tadman pointed out, dealing with it as a number doesn’t make sense. Converting it to binary is ideal.

    Convert from IPv6 to bytes:

    IPAddr.new('fe80::c').hton
# => "\xFE\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\f"

    Convert from bytes to IPv6:

    IPAddr::new_ntoh(_)
# => #<IPAddr: IPv6:fe80:0000:0000:0000:0000:0000:0000:000c/ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff>
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