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check subnet reverse
[root@home ~]# dig @8.8.8.8 -x 213.11.1.0 ns +noall +authority; ; DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 @8.8.8.8 -x 213.11.1.0…
Experiments in IT infrastructure, monitoring and automation, with practical notes on Linux, networking and observability