\conninfo

\conninfo outputs information about the current database connection.

• https://www.postgresql.org/docs/current/app-psql.html

\conninfo 
You are connected to database "your_DB" as user "your_user" on host "yourhost.com" (address: "10.10.10.10") at port 5432.
SSL connection (protocol: TLSv1.2, cipher: ECDHE-RSA-AES256-GCM-SHA384, bits: 256, compression: off)

See also

• PostgreSQL: psql, .psqlrc, .pgpass, $HOME/.pg service.conf, -U, -W, -d, meta-commands: \du, \dg, \ddp, \dp, \list, \dn, \dt, \c, \l, \di, \q, show users, show, su - postgres, psql -c, \?, \connect, \conninfo, --version, --help, PL/pgSQL