sudo pico /private/etc/hosts でhostsを編集、以下の行を追加すればたぶんOK。
DNSが浸透した後は元に戻した方が無難ですが。
203.192.159.250 kyusyu.machibbs.com
203.192.159.250 okinawa.machibbs.com
203.192.159.250 tawara.machibbs.com
203.192.159.250 www.machibbs.com
203.192.159.251 hokkaido.machibbs.com
203.192.159.251 kousinetu.machibbs.com
203.192.159.251 tohoku.machibbs.com
203.192.159.252 chugoku.machibbs.com
203.192.159.252 kinki.machibbs.com
203.192.159.252 osaka.machibbs.com
203.192.159.252 sikoku.machibbs.com
203.192.159.252 tokai.machibbs.com
203.192.159.253 kana.machibbs.com
203.192.159.253 kanto.machibbs.com
203.192.159.253 tama.machibbs.com
203.192.159.253 tokyo.machibbs.com