Summarization technique

From: peter brown (pita40@xxxxxxxxxxx)
Date: Mon Jan 22 2001 - 04:29:10 GMT-3

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I have always been confused about summarization. The part that confuses me
is not how you get the mask but how you change the bits in the octet

For example Caslow in page 306

Summarize 172.16.29.0, 172.16.30.0, 172.16.31,0

128 64 32 16 8 4 2 1
29 0 0 0 1 1 1 0 1
30 0 0 0 1 1 1 1 0
31 0 0 0 1 1 1 1 1

he then said the summary is 172.16.28.0 255.255.252.0
My question is how did he get 28 in the third octet.

Please help.

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