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How to get Subnet from an IP in Java
Calling a function of a module by using its name (a string)Is Java “pass-by-reference” or “pass-by-value”?How do I check whether a file exists without exceptions?How do I read / convert an InputStream into a String in Java?How do I generate random integers within a specific range in Java?Convert bytes to a string?How do I sort a dictionary by value?Interface vs Abstract Class (general OO)What is a JavaBean exactly?How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
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How do I get the subnet value from an IP Address.
For eg, we can do below in Python. (But how about Java?)
interface = ipaddress.IPv4Interface('11.22.104.0/0.0.0.255')
value = interface.with_prefixlen
Output of value = 11.22.104.0/24
Basically, I need a function to convert 0.0.0.255 into /24. Thanks.
Edit
-Java 7 is used.
java python interface ip subnet
asked Dec 21 '16 at 6:32
user1841495user1841495
306
add a comment |
How do I get the subnet value from an IP Address.
For eg, we can do below in Python. (But how about Java?)
interface = ipaddress.IPv4Interface('11.22.104.0/0.0.0.255')
value = interface.with_prefixlen
Output of value = 11.22.104.0/24
Basically, I need a function to convert 0.0.0.255 into /24. Thanks.
Edit
-Java 7 is used.
java python interface ip subnet
asked Dec 21 '16 at 6:32
user1841495user1841495
306
add a comment |
How do I get the subnet value from an IP Address.
For eg, we can do below in Python. (But how about Java?)
interface = ipaddress.IPv4Interface('11.22.104.0/0.0.0.255')
value = interface.with_prefixlen
Output of value = 11.22.104.0/24
Basically, I need a function to convert 0.0.0.255 into /24. Thanks.
Edit
-Java 7 is used.
java python interface ip subnet
asked Dec 21 '16 at 6:32
user1841495user1841495
306
How do I get the subnet value from an IP Address.
For eg, we can do below in Python. (But how about Java?)
interface = ipaddress.IPv4Interface('11.22.104.0/0.0.0.255')
value = interface.with_prefixlen
Output of value = 11.22.104.0/24
Basically, I need a function to convert 0.0.0.255 into /24. Thanks.
Edit
-Java 7 is used.
java python interface ip subnet
java python interface ip subnet
asked Dec 21 '16 at 6:32
user1841495user1841495
306
asked Dec 21 '16 at 6:32
user1841495user1841495
306
edited Dec 21 '16 at 7:30
user1841495
asked Dec 21 '16 at 6:32
user1841495user1841495
306
asked Dec 21 '16 at 6:32
user1841495user1841495
306
asked Dec 21 '16 at 6:32
user1841495user1841495
306
306
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
With Guava:
int slash = Integer.bitCount(
~Ints.fromByteArray(
InetAddresses.forString("0.0.0.255").getAddress()));
With Java 8:
int slash = Arrays.stream("0.0.0.255".split("\."))
.mapToInt(Integer::parseInt)
.map(i -> ~i & 0xFF)
.map(Integer::bitCount)
.sum();
With Java 7:
int slash = 0;
for (String octet : "0.0.0.255".split("\."))
slash += Integer.bitCount(~Integer.parseInt(octet) & 0xFF);
The value of slash will be 24.
answered Dec 21 '16 at 7:21
shmoselshmosel
37.2k43997
Is there any ready-to-use library in Java 7? My application is using Java 7, hence the code provided above is not working. Sorry for never mentioning the Java version.
– user1841495
Dec 21 '16 at 7:29
@user1841495 Added a Java 7 version.
– shmosel
Dec 21 '16 at 7:33
Thanks for the solution for Java 7, do you mind to make some explanation? I'm going to test with this solution shortly. Thanks a lot.
– user1841495
Dec 21 '16 at 10:19
@user1841495 Basically we're converting the IP address to 4 unsigned bytes, then counting the inverted bits (because this is a wildcard mask).
– shmosel
Dec 21 '16 at 18:09
add a comment |
The IPAddress Java library supports both IPv4 and IPv6 subnets in a polymorphic manner. Disclaimer: I am the project manager. The following code will convert a host mask to a prefix length:
IPAddressString maskString = new IPAddressString("0.0.0.255");
IPAddress mask = maskString.toAddress();
Integer prefLen = mask.getBlockMaskPrefixLength(false);//24
answered Mar 22 at 22:17
Sean FSean F
2,096614
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
With Guava:
int slash = Integer.bitCount(
~Ints.fromByteArray(
InetAddresses.forString("0.0.0.255").getAddress()));
With Java 8:
int slash = Arrays.stream("0.0.0.255".split("\."))
.mapToInt(Integer::parseInt)
.map(i -> ~i & 0xFF)
.map(Integer::bitCount)
.sum();
With Java 7:
int slash = 0;
for (String octet : "0.0.0.255".split("\."))
slash += Integer.bitCount(~Integer.parseInt(octet) & 0xFF);
The value of slash will be 24.
answered Dec 21 '16 at 7:21
shmoselshmosel
37.2k43997
Is there any ready-to-use library in Java 7? My application is using Java 7, hence the code provided above is not working. Sorry for never mentioning the Java version.
– user1841495
Dec 21 '16 at 7:29
@user1841495 Added a Java 7 version.
– shmosel
Dec 21 '16 at 7:33
Thanks for the solution for Java 7, do you mind to make some explanation? I'm going to test with this solution shortly. Thanks a lot.
– user1841495
Dec 21 '16 at 10:19
@user1841495 Basically we're converting the IP address to 4 unsigned bytes, then counting the inverted bits (because this is a wildcard mask).
– shmosel
Dec 21 '16 at 18:09
add a comment |
With Guava:
int slash = Integer.bitCount(
~Ints.fromByteArray(
InetAddresses.forString("0.0.0.255").getAddress()));
With Java 8:
int slash = Arrays.stream("0.0.0.255".split("\."))
.mapToInt(Integer::parseInt)
.map(i -> ~i & 0xFF)
.map(Integer::bitCount)
.sum();
With Java 7:
int slash = 0;
for (String octet : "0.0.0.255".split("\."))
slash += Integer.bitCount(~Integer.parseInt(octet) & 0xFF);
The value of slash will be 24.
answered Dec 21 '16 at 7:21
shmoselshmosel
37.2k43997
Is there any ready-to-use library in Java 7? My application is using Java 7, hence the code provided above is not working. Sorry for never mentioning the Java version.
– user1841495
Dec 21 '16 at 7:29
@user1841495 Added a Java 7 version.
– shmosel
Dec 21 '16 at 7:33
Thanks for the solution for Java 7, do you mind to make some explanation? I'm going to test with this solution shortly. Thanks a lot.
– user1841495
Dec 21 '16 at 10:19
@user1841495 Basically we're converting the IP address to 4 unsigned bytes, then counting the inverted bits (because this is a wildcard mask).
– shmosel
Dec 21 '16 at 18:09
add a comment |
With Guava:
int slash = Integer.bitCount(
~Ints.fromByteArray(
InetAddresses.forString("0.0.0.255").getAddress()));
With Java 8:
int slash = Arrays.stream("0.0.0.255".split("\."))
.mapToInt(Integer::parseInt)
.map(i -> ~i & 0xFF)
.map(Integer::bitCount)
.sum();
With Java 7:
int slash = 0;
for (String octet : "0.0.0.255".split("\."))
slash += Integer.bitCount(~Integer.parseInt(octet) & 0xFF);
The value of slash will be 24.
answered Dec 21 '16 at 7:21
shmoselshmosel
37.2k43997
With Guava:
int slash = Integer.bitCount(
~Ints.fromByteArray(
InetAddresses.forString("0.0.0.255").getAddress()));
With Java 8:
int slash = Arrays.stream("0.0.0.255".split("\."))
.mapToInt(Integer::parseInt)
.map(i -> ~i & 0xFF)
.map(Integer::bitCount)
.sum();
With Java 7:
int slash = 0;
for (String octet : "0.0.0.255".split("\."))
slash += Integer.bitCount(~Integer.parseInt(octet) & 0xFF);
The value of slash will be 24.
answered Dec 21 '16 at 7:21
shmoselshmosel
37.2k43997
edited Dec 21 '16 at 7:32
answered Dec 21 '16 at 7:21
shmoselshmosel
37.2k43997
answered Dec 21 '16 at 7:21
shmoselshmosel
37.2k43997
answered Dec 21 '16 at 7:21
shmoselshmosel
37.2k43997
37.2k43997
Is there any ready-to-use library in Java 7? My application is using Java 7, hence the code provided above is not working. Sorry for never mentioning the Java version.
– user1841495
Dec 21 '16 at 7:29
@user1841495 Added a Java 7 version.
– shmosel
Dec 21 '16 at 7:33
Thanks for the solution for Java 7, do you mind to make some explanation? I'm going to test with this solution shortly. Thanks a lot.
– user1841495
Dec 21 '16 at 10:19
@user1841495 Basically we're converting the IP address to 4 unsigned bytes, then counting the inverted bits (because this is a wildcard mask).
– shmosel
Dec 21 '16 at 18:09
add a comment |
Is there any ready-to-use library in Java 7? My application is using Java 7, hence the code provided above is not working. Sorry for never mentioning the Java version.
– user1841495
Dec 21 '16 at 7:29
@user1841495 Added a Java 7 version.
– shmosel
Dec 21 '16 at 7:33
Thanks for the solution for Java 7, do you mind to make some explanation? I'm going to test with this solution shortly. Thanks a lot.
– user1841495
Dec 21 '16 at 10:19
@user1841495 Basically we're converting the IP address to 4 unsigned bytes, then counting the inverted bits (because this is a wildcard mask).
– shmosel
Dec 21 '16 at 18:09
Is there any ready-to-use library in Java 7? My application is using Java 7, hence the code provided above is not working. Sorry for never mentioning the Java version.
– user1841495
Dec 21 '16 at 7:29
Is there any ready-to-use library in Java 7? My application is using Java 7, hence the code provided above is not working. Sorry for never mentioning the Java version.
– user1841495
Dec 21 '16 at 7:29
@user1841495 Added a Java 7 version.
– shmosel
Dec 21 '16 at 7:33
@user1841495 Added a Java 7 version.
– shmosel
Dec 21 '16 at 7:33
Thanks for the solution for Java 7, do you mind to make some explanation? I'm going to test with this solution shortly. Thanks a lot.
– user1841495
Dec 21 '16 at 10:19
Thanks for the solution for Java 7, do you mind to make some explanation? I'm going to test with this solution shortly. Thanks a lot.
– user1841495
Dec 21 '16 at 10:19
@user1841495 Basically we're converting the IP address to 4 unsigned bytes, then counting the inverted bits (because this is a wildcard mask).
– shmosel
Dec 21 '16 at 18:09
@user1841495 Basically we're converting the IP address to 4 unsigned bytes, then counting the inverted bits (because this is a wildcard mask).
– shmosel
Dec 21 '16 at 18:09
add a comment |
The IPAddress Java library supports both IPv4 and IPv6 subnets in a polymorphic manner. Disclaimer: I am the project manager. The following code will convert a host mask to a prefix length:
IPAddressString maskString = new IPAddressString("0.0.0.255");
IPAddress mask = maskString.toAddress();
Integer prefLen = mask.getBlockMaskPrefixLength(false);//24
answered Mar 22 at 22:17
Sean FSean F
2,096614
add a comment |
The IPAddress Java library supports both IPv4 and IPv6 subnets in a polymorphic manner. Disclaimer: I am the project manager. The following code will convert a host mask to a prefix length:
IPAddressString maskString = new IPAddressString("0.0.0.255");
IPAddress mask = maskString.toAddress();
Integer prefLen = mask.getBlockMaskPrefixLength(false);//24
answered Mar 22 at 22:17
Sean FSean F
2,096614
add a comment |
The IPAddress Java library supports both IPv4 and IPv6 subnets in a polymorphic manner. Disclaimer: I am the project manager. The following code will convert a host mask to a prefix length:
IPAddressString maskString = new IPAddressString("0.0.0.255");
IPAddress mask = maskString.toAddress();
Integer prefLen = mask.getBlockMaskPrefixLength(false);//24
answered Mar 22 at 22:17
Sean FSean F
2,096614
The IPAddress Java library supports both IPv4 and IPv6 subnets in a polymorphic manner. Disclaimer: I am the project manager. The following code will convert a host mask to a prefix length:
IPAddressString maskString = new IPAddressString("0.0.0.255");
IPAddress mask = maskString.toAddress();
Integer prefLen = mask.getBlockMaskPrefixLength(false);//24
answered Mar 22 at 22:17
Sean FSean F
2,096614
answered Mar 22 at 22:17
Sean FSean F
2,096614
answered Mar 22 at 22:17
Sean FSean F
2,096614
answered Mar 22 at 22:17
Sean FSean F
2,096614
2,096614
add a comment |
add a comment |
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