Java Utililty Methods InetAddress Check

List of utility methods to do InetAddress Check

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Description

The list of methods to do InetAddress Check are organized into topic(s).

Method

booleanisPrivate(InetAddress addr)
is Private 
byte[] addrb = addr.getAddress();
for (int i = PRIVATE_ADDRS.length; --i >= 0;) {
    boolean valid = true;
    for (int j = 0; j < PRIVATE_ADDRS[i].length; j++)
        if (PRIVATE_ADDRS[i][j] != (addrb[j] & 0xFF)) {
            valid = false;
            break;
    if (valid)
        return true;
return false;
booleanisPrivate(InetAddress adr)
is Private 
return !(isPublic(adr) || isLoopback(adr) || isTenDot(adr));
booleanisPrivateIp(final InetAddress address)
Determines if a given IP address is private. 
Objects.requireNonNull("IP address must be present");
return address.isAnyLocalAddress() || address.isLoopbackAddress() || address.isLinkLocalAddress()
        || address.isSiteLocalAddress();
booleanisPrivateIp(InetAddress addr)
See if given address is private or not 
boolean result = false;
if (addr instanceof Inet4Address) {
    result = isPrivateIp((Inet4Address) addr);
} else if (addr instanceof Inet6Address) {
    result = isPrivateIp((Inet6Address) addr);
return result;
booleanisPrivateIP(InetAddress ip)
Determines if the supplied IP Address is a private non-routed IP Address. 
if (ip.isSiteLocalAddress())
    return true;
else if (ip instanceof Inet6Address)
    return ip.getAddress()[0] == IP6_PRIVATE_PREFIX;
return false;
booleanisPrivateNetworkAddress(final InetAddress inetAddress)
Returns whether the given internet address is reserved for private networks, such as those behind a NAT router. 
assert inetAddress != null : "inetAddress must not be null";
final String inetAddressString = inetAddress.getHostAddress();
return inetAddressString.startsWith("192.168.") || inetAddressString.startsWith("10.")
        || inetAddressString.startsWith("172.");
booleanisPrivateSubnet(InetAddress address)
Check if this is a private address, not exposed on the public Internet. 
return address.isSiteLocalAddress() || address.isLoopbackAddress() || address.isLinkLocalAddress();
booleanisPublic(InetAddress inetAddress)
is Public 
String hostAddress = inetAddress.getHostAddress();
if (hostAddress.startsWith("10.") 
        || hostAddress.startsWith("192.168.") 
        || hostAddress.startsWith("169.254.") 
        || hostAddress.startsWith("127.")) { 
    return false;
if (hostAddress.startsWith("172.")) { 
...
booleanisPublicIp(InetAddress addr)
See if given address is public or not 
return !(isPrivateIp(addr) || isLoopbackIp(addr));
booleanisPublicIP4Address(InetAddress localAddress)
is Public IP Address 
Matcher matcher = NON_PUBLIC_IP.matcher(localAddress.getHostAddress());
return !matcher.find();