使用 awk 处理 nmap 扫描结果，求出存活主机IP
<div class="defaultpost"><div class="postmessage firstpost"><div class="t_msgfontfix">在使用 nmap 扫描时，得到如下结果：结果1：
Interesting ports on 172.22.43.23:
PORT STATE SERVICE
22/tcp open ssh
Interesting ports on 172.22.43.24:
PORT STATE SERVICE
22/tcp open ssh
Interesting ports on 172.22.43.25:
PORT STATE SERVICE
22/tcp open ssh
Interesting ports on 172.22.43.250:
PORT STATE SERVICE
22/tcp filtered ssh
Interesting ports on 172.22.43.251:
PORT STATE SERVICE
22/tcp open ssh
Nmap run completed -- 256 IP addresses (17 hosts up) scanned in 2.375 seconds
要求：如果 扫描 22 端口为 open 则打印 所扫IP地址 (如：172.22.43.251 的 22/tcp 为 open 则打印 这个 IP )
扫描结果2：
Interesting ports on 172.22.43.251:
PORT STATE SERVICE
5911/tcp closed unknown
5912/tcp closed unknown
5913/tcp closed unknown
5914/tcp closed unknown
5915/tcp closed unknown
5916/tcp closed unknown
5917/tcp closed unknown
5918/tcp closed unknown
5919/tcp closed unknown
5920/tcp closed unknown
Interesting ports on 172.22.43.252:
PORT STATE SERVICE
5911/tcp closed unknown
5912/tcp closed unknown
5913/tcp closed unknown
5914/tcp closed unknown
5915/tcp closed unknown
5916/tcp closed unknown
5917/tcp closed unknown
5918/tcp closed unknown
5919/tcp closed unknown
5920/tcp closed unknown
Interesting ports on 172.22.43.254:
PORT STATE SERVICE
5911/tcp closed unknown
5912/tcp open unknown
5913/tcp closed unknown
5914/tcp closed unknown
5915/tcp closed unknown
5916/tcp closed unknown
5917/tcp closed unknown
5918/tcp closed unknown
5919/tcp closed unknown
5920/tcp closed unknown
Nmap run completed -- 256 IP addresses (17 hosts up) scanned in 3.446 seconds
我在扫描 5911-5920 这10个端口时只要有一个端口为open，就打印这个IP地址 (如：172.22.43.254 的 5912/tcp 端口为 open的，就打印 172.22.43.254 这个IP)
不清楚这个 awk 应怎么写，求助!
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