diff --git a/412/vlsm.md b/412/vlsm.md
index bcc9b23..e0b61ee 100644
--- a/412/vlsm.md
+++ b/412/vlsm.md
@@ -1,9 +1,10 @@
 # VLSM Examples
 
-Say we have the IP: 210.19.14.0/24
+Say we have the IPs: 210.19.[14 -> 19].0/24
 
 We want to create to networks which support this many hosts
 
+## Part A
 * A: 1000 hosts
 * B: 500 hosts
 
@@ -16,3 +17,17 @@ If we want to support 1000 hosts we need to borrow the last two bits of that pat
 > __problem__: one of those is 1 which means we can't borrow it as its part of our given network address.
 
 Thus this problem then can't be done given this information.
+
+If we had been given x.x..12.0 we could do it because 12's bit pattern is `0000 1100`, which leaves the last two bits as 0's that we can use for the hosts.
+
+## Part B
+
+This time we need to support 500 hosts so we need 9 bits for the hosts. This time we can use `x.x.14.0` as our network address
+
+Our mask is /23 `255.255.154.0`. This leaves our network address as `210.19.14.0`.
+
+* The first host is x.x.14.1
+
+* The last host is x.x.15.254
+
+* Broadcast is x.x.15.255