p

diff --git a/src/acme/solvers/tls_alpn.rs b/src/acme/solvers/tls_alpn.rs
index 4143f83..f7fa6ae 100644
--- a/src/acme/solvers/tls_alpn.rs
+++ b/src/acme/solvers/tls_alpn.rs
@@ -537,7 +537,7 @@ fn acme_parse_ssl_server_name(
             let mut addr: u128 = 0;
             let mut it = v6.as_bytes().split(|x| *x == b'.');
 
-            for i in (0..128).step_by(4) {
+            for i in 0..32 {
                 let x = it.next().ok_or(ParseIdentifierError::InvalidV6Ptr)?;
 
                 if x.len() != 1 {
@@ -551,7 +551,7 @@ fn acme_parse_ssl_server_name(
                 };
 
                 // Max value is 0x0f << 124, does not overflow
-                addr += (x as u128) << i;
+                addr += (x as u128) << (i * 4);
             }
 
             if it.next().is_some() {