VBA IP Functions: IP manipulation with Visual Basic for Applications

Posted on March 9, 2017 by Andrea Fortuna

“Seriously? Are you still using VBA?”

Do you think that Visual Basic for Applications is ugly, slow, cumbersome, old and confusing?

Well … I agree with you!

But if you need to create a macro in Excel for IP lookup in a list of subnets, it can be useful exhume some code written several years ago.

And since now we have GitHub, why not publish it?

Maybe it can be useful to some other despairing programmer.

---

from the README on GitHub :

Functions List

IpIsValid

Returns true if an ip address is formated exactly as it should be: no space, no extra zero, no incorrect value

IpStrToBin

Converts a text IP address to binary

ex:

IpStrToBin(“1.2.3.4”) returns 16909060

IpBinToStr

Converts a binary IP address to text

ex:

IpBinToStr(16909060) returns “1.2.3.4”

IpAdd

ex:

IpAdd(“192.168.1.1”; 4) returns “192.168.1.5”

IpAdd(“192.168.1.1”; 256) returns “192.168.2.1”

IpAnd

IP logical AND

ex:

IpAnd(“192.168.1.1”; “255.255.255.0”) returns “192.168.1.0”

IpAdd2

another implementation of IpAdd which not use the binary representation

IpGetByte

get one byte from an ip address given its position

ex:

IpGetByte(“192.168.1.1”; 1) returns 192

IpSetByte

set one byte in an ip address given its position and value

ex:

IpSetByte(“192.168.1.1”; 4; 20) returns “192.168.1.20”

IpMask

returns an IP netmask from a subnet both notations are accepted

ex:

IpMask(“192.168.1.1/24”) returns “255.255.255.0”

IpMask(“192.168.1.1 255.255.255.0”) returns “255.255.255.0”

IpWildMask

returns an IP Wildcard (inverse) mask from a subnet both notations are accepted

ex:

IpWildMask(“192.168.1.1/24”) returns “0.0.0.255”

IpWildMask(“192.168.1.1 255.255.255.0”) returns “0.0.0.255”

IpInvertMask

returns an IP Wildcard (inverse) mask from a subnet mask or a subnet mask from a wildcard mask

ex:

IpWildMask(“255.255.255.0”) returns “0.0.0.255”

IpWildMask(“0.0.0.255”) returns “255.255.255.0”

IpMaskLen

returns prefix length from a mask given by a string notation (xx.xx.xx.xx)

ex:

IpMaskLen(“255.255.255.0”) returns 24 which is the number of bits of the subnetwork prefix

IpWithoutMask

removes the netmask notation at the end of the IP

ex:

IpWithoutMask(“192.168.1.1/24”) returns “192.168.1.1”

IpWithoutMask(“192.168.1.1 255.255.255.0”) returns “192.168.1.1”

IpSubnetLen

get the mask len from a subnet

ex: IpSubnetLen(“192.168.1.1/24”) returns 24

IpSubnetLen(“192.168.1.1 255.255.255.0”) returns 24

IpSubnetSize

returns the number of addresses in a subnet

ex:

IpSubnetSize(“192.168.1.32/29”) returns 8

IpSubnetSize(“192.168.1.0 255.255.255.0”) returns 256

IpClearHostBits

set to zero the bits in the host part of an address

ex:

IpClearHostBits(“192.168.1.1/24”) returns “192.168.1.0/24”

IpClearHostBits(“192.168.1.193 255.255.255.128”) returns “192.168.1.128 255.255.255.128”

IpIsInSubnet

returns TRUE if “ip” is in “subnet” subnet must have the / mask notation (xx.xx.xx.xx/yy)

ex:

IpIsInSubnet(“192.168.1.35”; “192.168.1.32/29”) returns TRUE

IpIsInSubnet(“192.168.1.35”; “192.168.1.32 255.255.255.248”) returns TRUE

IpIsInSubnet(“192.168.1.41”; “192.168.1.32/29”) returns FALSE

IpSubnetVLookup

tries to match an IP address against a list of subnets in the left-most column of table_array and returns the value in the same row based on the index_number

this function selects the smallest matching subnet

“ip” is the value to search for in the subnets in the first column of the table_array

“table_array” is one or more columns of data

“index_number” is the column number in table_array from which the matching value must be returned. The first column which contains subnets is 1.

note: add the subnet 0.0.0.0/0 at the end of the array if you want the function to return a default value

IpSubnetMatch

tries to match an IP address against a list of subnets in the left-most column of table_array and returns the row number this function selects the smallest matching subnet

“ip” is the value to search for in the subnets in the first column of the table_array

“table_array” is one or more columns of data

returns 0 if the IP address is not matched.

IpSubnetIsInSubnet

returns TRUE if “subnet1” is in “subnet2” subnets must have the / mask notation (xx.xx.xx.xx/yy)

ex:

IpSubnetIsInSubnet(“192.168.1.35/30”; “192.168.1.32/29”) returns TRUE

IpSubnetIsInSubnet(“192.168.1.41/30”; “192.168.1.32/29”) returns FALSE

IpSubnetIsInSubnet(“192.168.1.35/28”; “192.168.1.32/29”) returns FALSE

IpSubnetInSubnetVLookup

tries to match a subnet against a list of subnets in the left-most column of table_array and returns the value in the same row based on the index_number the value matches if ‘subnet’ is equal or included in one of the subnets in the array

“subnet” is the value to search for in the subnets in the first column of the table_array

“table_array” is one or more columns of data

“index_number” is the column number in table_array from which the matching value must be returned. The first column which contains subnets is 1.

note: add the subnet 0.0.0.0/0 at the end of the array if you want the function to return a default value

IpSubnetInSubnetMatch

tries to match a subnet against a list of subnets in the left-most column of table_array and returns the row number the value matches if ‘subnet’ is equal or included in one of the subnets in the array

“subnet” is the value to search for in the subnets in the first column of the table_array

“table_array” is one or more columns of data

returns 0 if the subnet is not included in any of the subnets from the list

IpFindOverlappingSubnets

this function must be used in an array formula it will find in the list of subnets which subnets overlap

“SubnetsArray” is single column array containing a list of subnets, the list may be sorted or not the return value is also a array of the same size if the subnet on line x is included in a larger subnet from another line, this function returns an array in which line x contains the value of the larger subnet if the subnet on line x is distinct from any other subnet in the array, then this function returns on line x an empty cell if there are no overlapping subnets in the input array, the returned array is empty

IpSortArray

this function must be used in an array formula

“ip_array” is a single column array containing ip addresses the return value is also a array of the same size containing the same addresses sorted in ascending or descending order

“descending” is an optional parameter, if set to True the addresses are sorted in descending order

IpSubnetSortArray

this function must be used in an array formula

“ip_array” is a single column array containing ip subnets in “prefix/len” or “prefix mask” notation the return value is also an array of the same size containing the same subnets sorted in ascending or descending order

“descending” is an optional parameter, if set to True the subnets are sorted in descending order

IpParseRoute

this function is used by IpSubnetSortJoinArray to extract the subnet and next hop in route the supported formats are

10.0.0.0 255.255.255.0 1.2.3.4

10.0.0.0/24 1.2.3.4

the next hop can be any character sequence, and not only an IP

IpSubnetSortJoinArray

this fuction car sort and summarize subnets or ip routes it must be used in an array formula

“ip_array” is a single column array containing ip subnets in “prefix/len” or “prefix mask” notation

the return value is also an array of the same size containing the same subnets sorted in ascending order any consecutive subnets of the same size will be summarized when it is possible each line may contain any character sequence after the subnet, such as a next hop or any parameter of an ip route in this case, only subnets with the same parameters will be summarized

IpDivideSubnet

divide a network in smaller subnets

“n” is the value that will be added to the subnet length

“SubnetSeqNbr” is the index of the smaller subnet to return

ex:

IpDivideSubnet(“1.2.3.0/24”; 2; 0) returns “1.2.3.0/26”

IpDivideSubnet(“1.2.3.0/24”; 2; 1) returns “1.2.3.64/26”

IpIsPrivate

returns TRUE if “ip” is in one of the private IP address ranges

ex:

IpIsPrivate(“192.168.1.35”) returns TRUE

IpIsPrivate(“209.85.148.104”) returns FALSE

IpDiff

difference between 2 IP addresses

ex:

IpDiff(“192.168.1.7”; “192.168.1.1”) returns 6

IpParse

Parses an IP address by iteration from right to left Removes one byte from the right of “ip” and returns it as an integer

ex:

if ip=”192.168.1.32″

IpParse(ip) returns 32 and ip=”192.168.1″ when the function returns

IpBuild

Builds an IP address by iteration from right to left Adds “ip_byte” to the left the “ip”

If “ip_byte” is greater than 255, only the lower 8 bits are added to “ip” and the remaining bits are returned to be used on the next IpBuild call

ex 1:

if ip=”168.1.1″

IpBuild(192, ip) returns 0 and ip=”192.168.1.1″

ex 2:

if ip=”1″

IpBuild(258, ip) returns 1 and ip=”2.1″

IpMaskBin

returns binary IP mask from an address with / notation (xx.xx.xx.xx/yy)

ex:

IpMask(“192.168.1.1/24”) returns 4294967040 which is the binary representation of “255.255.255.0”

---

More info and downloads on GitHub repository:

https://github.com/andreafortuna/VBAIPFunctions