The list of blocked servers contains a few duplicated entries:

• 135d0fe03de33b9ecd8d24e97c7e312c1c5f5c99 - line 479 and 1899
• 222ab8a2602e498651e42d750f89416f6cf3fd11 - line 518 and 1906
• 6e7ec343c2d77ccdefbc39764acb302f98331132 - line 494 and 1902
• 9601c71d044833b3ecd38f34ab338c10ba25fb43 - line 524 and 1909
• cbd77f330c2f364a9751ea30303877dcf78c493e - line 551 and 1914
• f852d47b95ec0ff5f5e08c274f3999819967a905 - line 1678 and 2076

The following command can be used to find duplicate entries

curl https://sessionserver.mojang.com/blockedservers | sort | uniq -c | grep -v '^ *1 '