CREATE TABLE table_15257 ("Club" TEXT, "Played" TEXT, "Drawn" TEXT, "Lost" TEXT, "Points for" TEXT, "Points against" TEXT, "Tries for" TEXT, "Tries against" TEXT, "Try bonus" TEXT, "Losing bonus" TEXT)

Which of the clubs had 556 points against?
SELECT "Club" FROM table_15257 WHERE "Points against" = '556'
SELECT "Club" FROM "table_15257" WHERE "Points against" = '556'