Converting CIDR address to subnet mask and network address

Question

Given a CIDR address, e.g. 192.168.10.0/24

• How to determine mask length? (24)
• How to determine mask address? (255.255.

Answer 1

--plsql ip_calc by ku1gun
with a as
(
select
  '12.34.56.78/20' ip
from dual
),b as
(
select
  utl_raw.concat(utl_raw.substr(utl_raw.cast_from_binary_integer(to_number(regexp_substr(ip,'[^.]+',1,1)),2),1,1),utl_raw.substr(utl_raw.cast_from_binary_integer(to_number(regexp_substr(ip,'[^.]+',1,2)),2),1,1),utl_raw.substr(utl_raw.cast_from_binary_integer(to_number(regexp_substr(ip,'[^.]+',1,3)),2),1,1),utl_raw.substr(utl_raw.cast_from_binary_integer(to_number(regexp_substr(replace(ip,'/','.'),'[^.]+',1,4)),2),1,1)) ip,
  utl_raw.cast_from_binary_integer(power(2,32-to_number(regexp_substr(ip,'[^/]+',1,2)))-1) wildcard,
  utl_raw.bit_xor(utl_raw.cast_from_binary_integer(-1),utl_raw.cast_from_binary_integer(power(2,32-to_number(regexp_substr(ip,'[^/]+',1,2)))-1)) mask
from a
),c as
(
select
  utl_raw.bit_and(ip,mask) network_address,
  utl_raw.bit_or(utl_raw.bit_and(ip,mask),wildcard) broadcast_address,
  utl_raw.cast_from_binary_integer(utl_raw.cast_to_binary_integer(utl_raw.bit_and(ip,mask))+1) first_adress,
  utl_raw.cast_from_binary_integer(utl_raw.cast_to_binary_integer(utl_raw.bit_or(utl_raw.bit_and(ip,mask),wildcard))-1) last_adress,
  utl_raw.cast_from_binary_integer(utl_raw.cast_to_binary_integer(utl_raw.bit_and(ip,mask))+level) ip_address
from b
connect by level