/usr/include/asio/ip/ is in libasio-dev 1.4.1-3ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/asio/ip/address.hpp
/usr/include/asio/ip/address_v4.hpp
/usr/include/asio/ip/address_v6.hpp
/usr/include/asio/ip/basic_endpoint.hpp
/usr/include/asio/ip/basic_resolver.hpp
/usr/include/asio/ip/basic_resolver_entry.hpp
/usr/include/asio/ip/basic_resolver_iterator.hpp
/usr/include/asio/ip/basic_resolver_query.hpp
/usr/include/asio/ip/detail/
/usr/include/asio/ip/detail/socket_option.hpp
/usr/include/asio/ip/host_name.hpp
/usr/include/asio/ip/icmp.hpp
/usr/include/asio/ip/multicast.hpp
/usr/include/asio/ip/resolver_query_base.hpp
/usr/include/asio/ip/resolver_service.hpp
/usr/include/asio/ip/tcp.hpp
/usr/include/asio/ip/udp.hpp
/usr/include/asio/ip/unicast.hpp
/usr/include/asio/ip/v6_only.hpp