Allowing other host to connect to postgresql-9.1 and restart services in postgresql-9.1

Question

We need to add few Ip address in our pg_hba.conf file so that some new servers can connect to our postgresql database. We did the changes to pg_hba.conf like below

old pg_hba.conf

# TYPE  DATABASE        USER            ADDRESS                 METHOD
# "local" is for Unix domain socket connections only
local   all             all                                     trust
# IPv4 local connections:
host    all             all             127.0.0.1/32            password
host    all             all             10.150.0.0/16           password
host    all             all             10.156.14.0/23         password

New Ips to be added to pg_hba.conf

10.24.8.1 
10.150.256.170 
10.150.256.133 

We had done the changes to pg_hba.conf and added entries like below(we directly added IP address without /16 or /32) New pg_hba.conf

# TYPE  DATABASE        USER            ADDRESS                 METHOD
# "local" is for Unix domain socket connections only
local   all             all                                     trust
# IPv4 local connections:
host    all             all             127.0.0.1/32            password
host    all             all             10.150.0.0/16           password
host    all             all             10.156.14.0/23         password
host    all             all             10.24.8.1              password     
host    all             all             10.150.256.170         password
host    all             all             10.150.256.133         password 

Now, we need to restart the postgresql-9.1 server. I tried the below commands but nothing worked.

postgres:~> service status postgresql-9.1
Absolute path to 'service' is '/sbin/service', so it might be intended to be run only by user with superuser privileges (eg. root).
-bash: service: command not found
postgres:~> service postgresql-9.1 status
Absolute path to 'service' is '/sbin/service', so it might be intended to be run only by user with superuser privileges (eg. root).
-bash: service: command not found
postgres:~> systemctl status postgresql-9.4
If 'systemctl' is not a typo you can run the following command to lookup the package that contains the binary:
    command-not-found systemctl
-bash: systemctl: command not found

This is the server info having postgresql-9.1 installed

postgres:~> uname -a
Linux camboxtest1 3.0.101-108.87-default #1 SMP Fri Feb 22 16:42:57 UTC 2019 (10e85a8) x86_64 x86_64 x86_64 GNU/Linux

Did i add the IP address in right format ? What will be the command to restart the postgresql-9.1 services?