"triple backticks"

    Three backticks in a row – «```»

"neutral double quote"

    The character «"»
    Unicode U+0022 (QUOTATION MARK)

"neutral single quote"

    The character «'»
    Unicode U+0027 (APOSTROPHE)

"English double typographic quotes"

    The characters «“» and «”»
    Unicode U+201C (LEFT DOUBLE QUOTATION MARK) and Unicode U+201D (RIGHT DOUBLE QUOTATION MARK)

"English single typographic quotes"

    
    public static class WitnessIPAddress {
        private final InetAddress address;
        private final int flags;
        
        public static final int IPV4 = 0x01;
        public static final int IPV6 = 0x02;
        
        public WitnessIPAddress(InetAddress address) {
            this.address = address;
            this.flags = address.getAddress().length == 4 ? IPV4 : IPV6;
        }
        

   * @return {@code true} if the argument is a 6to4 address
   */
  public static boolean is6to4Address(Inet6Address ip) {
    byte[] bytes = ip.getAddress();
    return (bytes[0] == (byte) 0x20) && (bytes[1] == (byte) 0x02);
  }

  /**
   * Returns the IPv4 address embedded in a 6to4 address.
   *
   * @param ip {@link Inet6Address} to be examined for embedded IPv4 in 6to4 address

   * @return {@code true} if the argument is a 6to4 address
   */
  public static boolean is6to4Address(Inet6Address ip) {
    byte[] bytes = ip.getAddress();
    return (bytes[0] == (byte) 0x20) && (bytes[1] == (byte) 0x02);
  }

  /**
   * Returns the IPv4 address embedded in a 6to4 address.
   *
   * @param ip {@link Inet6Address} to be examined for embedded IPv4 in 6to4 address

20F1..20FF    ; disallowed                             # NA   <reserved-20F1>..<reserved-20FF>
2100          ; disallowed_STD3_mapped ; 0061 002F 0063 #1.1  ACCOUNT OF
2101          ; disallowed_STD3_mapped ; 0061 002F 0073 #1.1  ADDRESSED TO THE SUBJECT
2102          ; mapped                 ; 0063          # 1.1  DOUBLE-STRUCK CAPITAL C