chore(protocol): improve IPv6 address.

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (91fd4f8) 38.10% compared to head (245fbd2) 38.36%.

Files	Patch %	Lines
main.go	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #268 +/- ## ========================================== + Coverage 38.10% 38.36% +0.25% ========================================== Files 2 2 Lines 475 477 +2 ========================================== + Hits 181 183 +2 Misses 294 294 ```

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