libisccfg163 1:9.11.16+dfsg-3~build1 (amd64 binary) in ubuntu focal

 The Berkeley Internet Name Domain (BIND) implements an Internet domain
 name server. BIND is the most widely-used name server software on the
 Internet, and is supported by the Internet Software Consortium, www.isc.org.
 .
 This package delivers the libisccfg shared library used by BIND's daemons
 and clients to read and write ISC-style configuration files like named.conf
 and rndc.conf.