Provided by: sipcalc_1.1.5-1_amd64 bug


       sipcalc - IP subnet calculator


       sipcalc [ -abcdehiInrsStuvx46 ] <[ADDRESS] [INTERFACE] ... | [ - ]>


       Sipcalc  is  an  ip subnet calculator consisting of two parts.  A plain text based console
       version, and web (cgi) based counterpart.  This manpage only addresses the  console  based
       version.   Sipcalc,  in  it's  simplest  form takes an ip-address and a subnet mask on the
       commandline and outputs information about the subnet.  Sipcalc has support for  both  IPv4
       and IPv6 addresses.

       Sipcalc  can  take  input in three forms, an ip-address/netmask, an interface or via stdin
       using the special character -.

              Address must be given in the "standard" dotted quad  format,  ie.:
              and prepended with a netmask the can be given in three different ways:
               - CIDR, ex. /n where n >= 0 <= 32.
               - Dotted quad, ex.
               - A hex value, ex 0xnnnnnnnn or nnnnnnnn.

              Addresses may be given in any of the forms defined in RFC2373, the netmask (prefix)
              must be given in CIDR notion.  Valid values for the netmask range from n  >=  0  <=
              128, default value if netmask is omitted is 128.

              Instead  of  taking  address  information  from the commandline sipcalc can  obtain
              relevant information by looking at a specified interface  on  the  system.  Sipcalc
              then  uses  this  information  to calculate output values. This option is currently
              only available for IPv4 addresses, work is being done to support IPv6 here also.

       -      Further arguments will be read from stdin, this  can  be  useful  for  example  for
              cat(1)  ing  a  list  of  addresses stored in a file to sipcalc.  Each line sent to
              sipcalc should contain one address/netmask or interface.

       Any number/combination of Address and Interface arguments can exist  on  the  commandline,
       however,  the  special  character  - must be the first argument or it will be parsed as an
       interface.  All options following the - character will be discarded.

       Features (IPv4) -

       *      Multiple address and netmask input formats.

       *      Retrieving of address information from interfaces.

       *      Classfull and CIDR output.

       *      Multiple address and netmask output formats (dotted quad, hex, number of bits).

       *      Output of broadcast address, network class, Cisco  wildcard,  hosts/range,  network

       *      Output of multiple types of bitmaps.

       *      Output of a user-defined number of extra networks.

       *      Multiple networks input from commandline.

       *      DNS resolutions of hostnames.

       *      Parsing of a newline separated list of networks from standard input (STDIN).

       *      The  ability  to  "split" a network based on a smaller netmask, also with recursive
              runs on the generated subnets.

       Features (IPv6) -

       *      Compressed and expanded input addresses.

       *      Compressed and expanded output.

       *      Standard IPv6 network output.

       *      v4 in v6 output.

       *      Reverse dns address generation.

       *      DNS resolutions of hostnames.

       *      The ability to "split" a network based on a smaller netmask,  also  with  recursive
              runs on the generated subnets.


       Sipcalc  output  is  divided  into  sections and subsections. Each section starts with the
       string "-[type : INPUT] - n" where type can be one of int-ipv4, ipv6, ipv4. INPUT  is  one
       input  option  from  the  commandline  and  n is the number of the section that this input
       option has produced currently displayed.  Currently the only input  option  that  produces
       multiple output sections is an interface with multiple addresses. A subsection starts with
       the string "[IDENTIFIER]", where IDENTIFIER is an identifier for the subsection type.  The
       subsection  types  are based on the used commandline options.  Sections always en with the
       single character '-' alone on a line.  Worth mentioning is also that sections can  include
       not  only subsections, but also other sections, this currently only happen when the -u and
       -s/-S options are used.  Warnings/errors etc. can also be displayed in the form  -[type  :

       Description of common output:


       Host address
              The given host address.

       Network address
              The first address in a given range, unusable for hosts under normal conditions.

       Network mask
              The  network  mask  (netmask)  used  to specify the size of a given subnet, usually
              represented  in  three  different  formats:  dotted  quad   (   hex
              (0xnnnnnnnn) bits (/n where n >= 0 <= 32)

       Broadcast address
              The broadcast address of a given subnet, usually the last address in a range.

       Cisco wildcard
              The  inverted  value of the netmask (netmask ^ 0xffffffff).  This value is commonly
              used in for example access-lists on routers.

       Addresses in network
              The number of addresses in the given subnet.

       Network range
              The full subnet range.

       Usable range
              The range in the given subnet that is commonly used for normal hosts.


       Expanded Address
              The full expanded IPv6 address.

       Compressed address
              The IPv6 address compressed in the most efficient way possible.

       Subnet prefix
              The prefix of the address (in relation to the netmask), the suffix of  the  address
              is zeroed out.

       Address ID
              The  suffix  of the address (in relation to the netmask), the prefix of the address
              is zeroed out.

       Prefix address
              The IPv6 equivalent of the IPv4 netmask.

       Prefix length
              Number of bits set in the netmask.

       Address type
              The address type as defined in RFC2373.

              Some addresses will have comments from the author.

       Network range
              The start and end addresses of the subnet.

       Expanded v4inv6 address
              The full expanded IPv6 address in v4inv6 format.

       Compr. v4inv6 address
              The compressed IPv6 address in v4inv6 format.

       Reverse DNS
              The address in IPv6 reverse DNS form.


       -a, --all
              Give all possible information about an address or interface, this is equivalent  to
              giving the flags -b -c -i -n 0 for IPv4 and -e -r -t for IPv6.

       -b, --cidr-bitmap (IPv4)
              Display CIDR based bitmaps.

       -c, --classfull-addr (IPv4)
              Display classfull address information.

       -d, --resolve
              Enable name resolution.

       -e, --v4inv6 (IPv6)
              Display v4inv6 address information.

       -h, --help
              Display the commandline help.

       -i, --cidr-addr (default IPv4)
              Display CIDR address information.

       -I, --addr-int=INT
              Explicitly  add  an  interface.   This can be used to circumvent the sipcalc "smart
              parsing" of addresses/interfaces on the commandline. This can be useful if you  for
              example  for some reason have an interface with the same name as an actual address,
              eg. or ::1 etc.  See also: -4 -6.

       -n, --subnets=NUM
              Display NUM extra subnets (starting from the  current  subnet).  Will  display  all
              subnets in the current /24 if NUM is 0.

       -r, --v6rev (IPv6)
              Display IPv6 reverse DNS information.

       -s, --v4split=MASK (IPv4)
              Split  the  current  network into subnets of MASK size. MASK can be given in dotted
              quad, hex or CIDR form.

       -S, --v6split=MASK (IPv6)
              Split the current network into subnets of MASK size. MASK must  be  given  in  CIDR
              form, either with or with the '/' character.

       -t, --v6-standard (default IPv6)
              Display IPv6 address information.

       -u, --split-verbose
              This will put network splitting into verbose mode.  This means that all the subnets
              generated when splitting a network will be passed  back  to  sipcalc  for  explicit
              parsing giving the same output as if the address had been given on the commandline.
              All options passed to sipcalc on the commandline will also be  inherited  when  the
              subnet  is  passed back to sipcalc for parsing, with one exception, the -s/-S flag,
              we don't want an endless loop.  Sending only the -s/-S and -u flags to sipcalc will
              give the default output (-i for ipv4 and -t for ipv6).

       -v, --version
              Display version information.

       -w, --wildcard
              Takes a cisco wildcard (inverse mask) and display the corresponding regular netmask
              and netmask bit count.

       -x, --classful-bitmap (IPv6)
              Display a classfull bitmap.

       -4, --addr-ipv4=ADDR
              Explicitly add an IPv4 address.  See also: -I -6.

       -6, --addr-ipv6=ADDR
              Explicitly add an IPv6 address.  See also: -I -4.


       Probably lots.  Known missing features include getting IPv6 addresses from interfaces  and
       implementing  the  -n  option for IPv6 addresses.  Please send any bugs, feature requests,
       patches, comments etc. to


       Sipcalc can be downloaded from


       Simon Ekstrand <>.

                                         19 January 2002                               SIPCALC(1)