香港联通的AS10099的Blackhole Community 是10099:666
香港HGC运营商的AS9304的Blackhole Community 是9304:666
香港PCCW运营商的AS3491的Blackhole Community 是3491:666
NTT运营商的AS2914的Blackhole Community 是2914:666
Selective Blackhole communities
2914:661 only blackhole inside the region the announcement originated
2914:663 only blackhole inside the country the announcement originated
2914:660 only blackhole outside the region the announcement originated
2914:664 only blackhole outside the country the announcement originated
美国HE运营商的AS6939的Blackhole Community 是6939:666
为什么运营商默认都使用666作为Blackhole，这是因为参考的是IANA的定义，在IANA中BLACKHOLE (= 0xFFFF029A)，029A转换成十进制等于666。
666的定义来源：https://tools.ietf.org/html/rfc7999
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