diff --git a/crates/app/src/routes/api/v1/auth/ipbans.rs b/crates/app/src/routes/api/v1/auth/ipbans.rs
index eefe767..8a71d25 100644
--- a/crates/app/src/routes/api/v1/auth/ipbans.rs
+++ b/crates/app/src/routes/api/v1/auth/ipbans.rs
@@ -5,7 +5,7 @@ use crate::{
 };
 use axum::{Extension, Json, extract::Path, response::IntoResponse};
 use axum_extra::extract::CookieJar;
-use tetratto_core::model::{auth::IpBan, permissions::FinePermission};
+use tetratto_core::model::{addr::RemoteAddr, auth::IpBan, permissions::FinePermission};
 
 /// Create a new IP ban.
 pub async fn create_request(
@@ -24,7 +24,14 @@ pub async fn create_request(
         return Json(Error::NotAllowed.into());
     }
 
-    match data.create_ipban(IpBan::new(ip, user.id, req.reason)).await {
+    match data
+        .create_ipban(IpBan::new(
+            RemoteAddr::from(ip.as_str()).prefix(None),
+            user.id,
+            req.reason,
+        ))
+        .await
+    {
         Ok(_) => Json(ApiReturn {
             ok: true,
             message: "IP ban created".to_string(),
diff --git a/crates/app/src/routes/api/v1/auth/mod.rs b/crates/app/src/routes/api/v1/auth/mod.rs
index 0d9fe50..cfc6c29 100644
--- a/crates/app/src/routes/api/v1/auth/mod.rs
+++ b/crates/app/src/routes/api/v1/auth/mod.rs
@@ -18,6 +18,7 @@ use axum::{
 };
 use axum_extra::extract::CookieJar;
 use serde::Deserialize;
+use tetratto_core::model::addr::RemoteAddr;
 use tetratto_shared::hash::hash;
 
 use cf_turnstile::{SiteVerifyRequest, TurnstileClient};
@@ -52,7 +53,11 @@ pub async fn register_request(
         .to_string();
 
     // check for ip ban
-    if data.get_ipban_by_ip(&real_ip).await.is_ok() {
+    if data
+        .get_ipban_by_addr(RemoteAddr::from(real_ip.as_str()))
+        .await
+        .is_ok()
+    {
         return (None, Json(Error::NotAllowed.into()));
     }
 
diff --git a/crates/app/src/routes/api/v1/communities/posts.rs b/crates/app/src/routes/api/v1/communities/posts.rs
index ea510ef..dd9d19d 100644
--- a/crates/app/src/routes/api/v1/communities/posts.rs
+++ b/crates/app/src/routes/api/v1/communities/posts.rs
@@ -1,6 +1,12 @@
-use axum::{extract::Path, response::IntoResponse, Extension, Json};
+use axum::{
+    extract::Path,
+    http::{HeaderMap, HeaderValue},
+    response::IntoResponse,
+    Extension, Json,
+};
 use axum_extra::extract::CookieJar;
 use tetratto_core::model::{
+    addr::RemoteAddr,
     communities::Post,
     permissions::FinePermission,
     uploads::{MediaType, MediaUpload},
@@ -18,6 +24,7 @@ pub const MAXIMUM_FILE_SIZE: usize = 4194304;
 
 pub async fn create_request(
     jar: CookieJar,
+    headers: HeaderMap,
     Extension(data): Extension<State>,
     JsonMultipart(images, req): JsonMultipart<CreatePost>,
 ) -> impl IntoResponse {
@@ -42,6 +49,24 @@ pub async fn create_request(
         );
     }
 
+    // get real ip
+    let real_ip = headers
+        .get(data.0.security.real_ip_header.to_owned())
+        .unwrap_or(&HeaderValue::from_static(""))
+        .to_str()
+        .unwrap_or("")
+        .to_string();
+
+    // check for ip ban
+    if data
+        .get_ipban_by_addr(RemoteAddr::from(real_ip.as_str()))
+        .await
+        .is_ok()
+    {
+        return Json(Error::NotAllowed.into());
+    }
+
+    // ...
     let mut props = Post::new(
         req.content,
         match req.community.parse::<usize>() {
diff --git a/crates/core/src/database/ipbans.rs b/crates/core/src/database/ipbans.rs
index 64a64f6..71478cc 100644
--- a/crates/core/src/database/ipbans.rs
+++ b/crates/core/src/database/ipbans.rs
@@ -1,5 +1,6 @@
 use super::*;
 use crate::cache::Cache;
+use crate::model::addr::RemoteAddr;
 use crate::model::moderation::AuditLogEntry;
 use crate::model::{Error, Result, auth::IpBan, auth::User, permissions::FinePermission};
 use crate::{auto_method, execute, get, query_row, query_rows, params};
@@ -26,6 +27,30 @@ impl DataManager {
 
     auto_method!(get_ipban_by_ip(&str)@get_ipban_from_row -> "SELECT * FROM ipbans WHERE ip = $1" --name="ip ban" --returns=IpBan --cache-key-tmpl="atto.ipban:{}");
 
+    /// Get an IP ban as a [`RemoteAddr`].
+    ///
+    /// # Arguments
+    /// * `prefix`
+    pub async fn get_ipban_by_addr(&self, addr: RemoteAddr) -> Result<IpBan> {
+        let conn = match self.connect().await {
+            Ok(c) => c,
+            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
+        };
+
+        let res = query_row!(
+            &conn,
+            "SELECT * FROM ipbans WHERE ip LIKE $1",
+            &[&format!("{}%", addr.prefix(None))],
+            |x| { Ok(Self::get_ipban_from_row(x)) }
+        );
+
+        if res.is_err() {
+            return Err(Error::GeneralNotFound("ip ban".to_string()));
+        }
+
+        Ok(res.unwrap())
+    }
+
     /// Get all IP bans (paginated).
     ///
     /// # Arguments
diff --git a/crates/core/src/model/addr.rs b/crates/core/src/model/addr.rs
new file mode 100644
index 0000000..2f92e63
--- /dev/null
+++ b/crates/core/src/model/addr.rs
@@ -0,0 +1,61 @@
+use std::net::SocketAddr;
+
+/// How many bytes should be chopped off the end of an IPV6 address to get its prefix.
+pub(crate) const IPV6_PREFIX_BYTES: usize = 8;
+
+/// The protocol of a [`RemoteAddr`].
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum AddrProto {
+    IPV4,
+    IPV6,
+}
+
+/// A representation of a remote IP address.
+#[derive(Clone, Debug)]
+pub struct RemoteAddr(pub SocketAddr, pub AddrProto);
+
+impl From<&str> for RemoteAddr {
+    fn from(value: &str) -> Self {
+        if value.len() >= 16 {
+            // ipv6 (16 bytes; 128 bits)
+            if !(value.starts_with("[") | value.contains("]:1000")) {
+                Self(format!("[{value}]:1000").parse().unwrap(), AddrProto::IPV6)
+            } else {
+                Self(value.parse().unwrap(), AddrProto::IPV6)
+            }
+        } else {
+            // ipv4 (4 bytes; 32 bits)
+            Self(value.parse().unwrap(), AddrProto::IPV4)
+        }
+    }
+}
+
+impl RemoteAddr {
+    /// Get the address' prefix (returns the entire address for IPV4 addresses).
+    ///
+    ///  Operates on the IP address **without** colon characters.
+    pub fn prefix(&self, chop: Option<usize>) -> String {
+        if self.1 == AddrProto::IPV4 {
+            return self.0.to_string();
+        }
+
+        // we're adding 2 bytes to the chop bytes because we also
+        // need to remove 2 colons
+        let as_string = self.ipv6_inner();
+        (&as_string[0..(match chop {
+            Some(c) => c,
+            None => IPV6_PREFIX_BYTES,
+        } + (IPV6_PREFIX_BYTES / 4))])
+            .to_string()
+    }
+
+    /// [`Self::prefix`], but it returns another [`RemoteAddr`].
+    pub fn to_prefix(self, chop: Option<usize>) -> Self {
+        Self::from(self.prefix(chop).as_str())
+    }
+
+    /// Get the innter content from the address (as ipv6).
+    pub fn ipv6_inner(&self) -> String {
+        self.0.to_string().replace("[", "").replace("]:1000", "")
+    }
+}
diff --git a/crates/core/src/model/mod.rs b/crates/core/src/model/mod.rs
index 12b52b4..abd044a 100644
--- a/crates/core/src/model/mod.rs
+++ b/crates/core/src/model/mod.rs
@@ -1,3 +1,4 @@
+pub mod addr;
 pub mod auth;
 pub mod communities;
 pub mod communities_permissions;