diff --git a/source/data/brkitr/rules/word.txt b/source/data/brkitr/rules/word.txt
index a2eef17e6..abd20b8ce 100644
--- a/source/data/brkitr/rules/word.txt
+++ b/source/data/brkitr/rules/word.txt
@@ -41,9 +41,17 @@ $Hebrew_Letter      = [\p{Word_Break = Hebrew_Letter}];
 $ALetter            = [\p{Word_Break = ALetter}];
 $Single_Quote       = [\p{Word_Break = Single_Quote}];
 $Double_Quote       = [\p{Word_Break = Double_Quote}];
-$MidNumLet          = [\p{Word_Break = MidNumLet}];
-$MidLetter          = [\p{Word_Break = MidLetter}];
-$MidNum             = [\p{Word_Break = MidNum}];
+
+# Remove two full stop characters from $MidNumLet and add them to $MidNum
+# to break a hostname into its components at the cost of breaking
+# 'e.g.' and 'i.e.' as well.
+# $MidNumLet is used in rules 6/7 (rules of our interest) and rules 11/12.
+# Because it's OR'd with $MidNum in rules 11/12, rules 11/12 are not affected
+# while rules 6/7 are reverted to the old behavior we want.
+$MidNumLet          = [[\p{Word_Break = MidNumLet}] - [\u002E \uFF0E]];
+$MidLetter          = [\p{Word_Break = MidLetter} - [\: \uFE55 \uFF1A]];
+$MidNum             = [\p{Word_Break = MidNum}[\u002E \uFF0E]];
+
 $Numeric            = [\p{Word_Break = Numeric}];
 $ExtendNumLet       = [\p{Word_Break = ExtendNumLet}];
 $WSegSpace          = [\p{Word_Break = WSegSpace}];
diff --git a/source/data/brkitr/rules/word_POSIX.txt b/source/data/brkitr/rules/word_POSIX.txt
index 73ddc8dc1..46395309b 100644
--- a/source/data/brkitr/rules/word_POSIX.txt
+++ b/source/data/brkitr/rules/word_POSIX.txt
@@ -41,9 +41,12 @@ $Hebrew_Letter      = [\p{Word_Break = Hebrew_Letter}];
 $ALetter            = [\p{Word_Break = ALetter}];
 $Single_Quote       = [\p{Word_Break = Single_Quote}];
 $Double_Quote       = [\p{Word_Break = Double_Quote}];
-$MidNumLet          = [\p{Word_Break = MidNumLet} - [.]];
-$MidLetter          = [\p{Word_Break = MidLetter} - [\:]];
-$MidNum             = [\p{Word_Break = MidNum} [.]];
+# Remove full-width full stop (\uff0e) from $MidNumLet and add it to $MidNum, in
+# addition to the ordinary full stop (dot, period, '.', \u002e).
+$MidNumLet          = [[\p{Word_Break = MidNumLet}] - [\u002E \uFF0E]];
+$MidLetter          = [\p{Word_Break = MidLetter} - [\: \uFE55 \uFF1A]];
+$MidNum             = [\p{Word_Break = MidNum}[\u002E \uFF0E]];
+
 $Numeric            = [\p{Word_Break = Numeric}];
 $ExtendNumLet       = [\p{Word_Break = ExtendNumLet}];
 $WSegSpace          = [\p{Word_Break = WSegSpace}];