assertThat(canonicalizeInetAddress(addressC)).isEqualTo(addressC)

    val addressD = decodeIpv6("abcd:ef01:2345:6789:abcd:ef01:2345:6789")!!
    assertThat(canonicalizeInetAddress(addressD)).isEqualTo(addressD)

    val addressE = decodeIpv6("2001:db8::1:0:0:1")!!
    assertThat(canonicalizeInetAddress(addressE)).isEqualTo(addressE)

    val addressF = decodeIpv6("0:0:0:0:0:ffff:7f00:1")!!

    // If the input is encased in square braces "[...]", drop 'em.
    val inetAddressByteArray =
      (
        if (host.startsWith("[") && host.endsWith("]")) {
          decodeIpv6(host, 1, host.length - 1)
        } else {
          decodeIpv6(host, 0, host.length)
        }
      ) ?: return null

    val address = canonicalizeInetAddress(inetAddressByteArray)