gnu: Add sipcalc.

* gnu/packages/admin.scm (sipcalc): New public variable.

gnu/packages/admin.scm

@@ -523,6 +523,50 @@ (define-public netcat
 would need and has several interesting built-in capabilities.")
     (license license:gpl2+)))
 
+(define-public sipcalc
+  (package
+    (name "sipcalc")
+    (version "1.1.6")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "http://www.routemeister.net/projects"
+                           "/sipcalc/files/sipcalc" "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0mv3wndj4z2bsshh2k8d5sy3j8wxzgf8mzmmkvj1k8gpcz37dm6g"))))
+    (build-system gnu-build-system)
+    (home-page "http://www.routemeister.net/projects/sipcalc/")
+    (synopsis "Command-line IP subnet calculator")
+    (description
+     "Sipcalc is an advanced command-line IP subnet calculator.  It can take
+multiple forms of input (IPv4/IPv6/interface/hostname) and output a multitude
+of information about a given subnet.
+
+Features include:
+
+@itemize @bullet
+@item IPv4
+@itemize
+@item Retrieving of address information from interfaces.
+@item Classfull and CIDR output.
+@item Multiple address and netmask input and output formats (dotted quad, hex,
+number of bits).
+@item Output of broadcast address, network class, Cisco wildcard,
+hosts/range, network range.
+@item The ability to split a network based on a smaller netmask, now also with
+recursive runs on the generated subnets.  (also IPv6)
+@end itemize
+@item IPv6
+@itemize
+@item Compressed and expanded input and output addresses.
+@item Standard IPv6 network output.
+@item v4 in v6 output.
+@item Reverse DNS address generation.
+@end itemize
+@end itemize\n")
+    (license license:bsd-3)))
+
 (define-public alive
   (package
     (name "alive")