diff --git a/esphome/components/api/api_connection.cpp b/esphome/components/api/api_connection.cpp
index 08f01c9391d..d9f1574ad3e 100644
--- a/esphome/components/api/api_connection.cpp
+++ b/esphome/components/api/api_connection.cpp
@@ -130,9 +130,8 @@ void APIConnection::start() {
     return;
   }
   // Initialize client name with peername (IP address) until Hello message provides actual name
-  char peername[socket::PEERNAME_MAX_LEN];
-  size_t len = this->helper_->getpeername_to(peername);
-  this->helper_->set_client_name(peername, len);
+  const char *peername = this->helper_->get_client_peername();
+  this->helper_->set_client_name(peername, strlen(peername));
 }
 
 APIConnection::~APIConnection() {
@@ -1505,10 +1504,8 @@ void APIConnection::complete_authentication_() {
   this->flags_.connection_state = static_cast<uint8_t>(ConnectionState::AUTHENTICATED);
   this->log_client_(ESPHOME_LOG_LEVEL_DEBUG, LOG_STR("connected"));
 #ifdef USE_API_CLIENT_CONNECTED_TRIGGER
-  char peername_buf[socket::PEERNAME_MAX_LEN];
-  this->helper_->getpeername_to(peername_buf);
   this->parent_->get_client_connected_trigger()->trigger(std::string(this->helper_->get_client_name()),
-                                                         std::string(peername_buf));
+                                                         std::string(this->helper_->get_client_peername()));
 #endif
 #ifdef USE_HOMEASSISTANT_TIME
   if (homeassistant::global_homeassistant_time != nullptr) {
@@ -1527,10 +1524,8 @@ bool APIConnection::send_hello_response(const HelloRequest &msg) {
   this->helper_->set_client_name(msg.client_info.c_str(), msg.client_info.size());
   this->client_api_version_major_ = msg.api_version_major;
   this->client_api_version_minor_ = msg.api_version_minor;
-  char peername[socket::PEERNAME_MAX_LEN];
-  this->helper_->getpeername_to(peername);
   ESP_LOGV(TAG, "Hello from client: '%s' | %s | API Version %" PRIu32 ".%" PRIu32, this->helper_->get_client_name(),
-           peername, this->client_api_version_major_, this->client_api_version_minor_);
+           this->helper_->get_client_peername(), this->client_api_version_major_, this->client_api_version_minor_);
 
   HelloResponse resp;
   resp.api_version_major = 1;
@@ -2081,17 +2076,13 @@ void APIConnection::process_state_subscriptions_() {
 #endif  // USE_API_HOMEASSISTANT_STATES
 
 void APIConnection::log_client_(int level, const LogString *message) {
-  char peername[socket::PEERNAME_MAX_LEN];
-  this->helper_->getpeername_to(peername);
-  esp_log_printf_(level, TAG, __LINE__, ESPHOME_LOG_FORMAT("%s (%s): %s"), this->helper_->get_client_name(), peername,
-                  LOG_STR_ARG(message));
+  esp_log_printf_(level, TAG, __LINE__, ESPHOME_LOG_FORMAT("%s (%s): %s"), this->helper_->get_client_name(),
+                  this->helper_->get_client_peername(), LOG_STR_ARG(message));
 }
 
 void APIConnection::log_warning_(const LogString *message, APIError err) {
-  char peername[socket::PEERNAME_MAX_LEN];
-  this->helper_->getpeername_to(peername);
-  ESP_LOGW(TAG, "%s (%s): %s %s errno=%d", this->helper_->get_client_name(), peername, LOG_STR_ARG(message),
-           LOG_STR_ARG(api_error_to_logstr(err)), errno);
+  ESP_LOGW(TAG, "%s (%s): %s %s errno=%d", this->helper_->get_client_name(), this->helper_->get_client_peername(),
+           LOG_STR_ARG(message), LOG_STR_ARG(api_error_to_logstr(err)), errno);
 }
 
 }  // namespace esphome::api
diff --git a/esphome/components/api/api_connection.h b/esphome/components/api/api_connection.h
index 2d137404f57..95a3eed2029 100644
--- a/esphome/components/api/api_connection.h
+++ b/esphome/components/api/api_connection.h
@@ -280,10 +280,8 @@ class APIConnection final : public APIServerConnection {
   bool send_buffer(ProtoWriteBuffer buffer, uint8_t message_type) override;
 
   const char *get_name() const { return this->helper_->get_client_name(); }
-  /// Get peer name (IP address) into a stack buffer - avoids heap allocation
-  size_t get_peername_to(std::span<char, socket::PEERNAME_MAX_LEN> buf) const {
-    return this->helper_->getpeername_to(buf);
-  }
+  /// Get peer name (IP address) - cached at connection init time
+  const char *get_peername() const { return this->helper_->get_client_peername(); }
 
  protected:
   // Helper function to handle authentication completion
diff --git a/esphome/components/api/api_frame_helper.cpp b/esphome/components/api/api_frame_helper.cpp
index 373d27260a2..dd44fe9e175 100644
--- a/esphome/components/api/api_frame_helper.cpp
+++ b/esphome/components/api/api_frame_helper.cpp
@@ -16,12 +16,7 @@ static const char *const TAG = "api.frame_helper";
 static constexpr size_t API_MAX_LOG_BYTES = 168;
 
 #if ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_VERY_VERBOSE
-#define HELPER_LOG(msg, ...) \
-  do { \
-    char peername__[socket::PEERNAME_MAX_LEN]; \
-    this->socket_->getpeername_to(peername__); \
-    ESP_LOGVV(TAG, "%s (%s): " msg, this->client_name_, peername__, ##__VA_ARGS__); \
-  } while (0)
+#define HELPER_LOG(msg, ...) ESP_LOGVV(TAG, "%s (%s): " msg, this->client_name_, this->client_peername_, ##__VA_ARGS__)
 #else
 #define HELPER_LOG(msg, ...) ((void) 0)
 #endif
@@ -250,6 +245,8 @@ APIError APIFrameHelper::init_common_() {
     HELPER_LOG("Bad state for init %d", (int) state_);
     return APIError::BAD_STATE;
   }
+  // Cache peername now while socket is valid - needed for error logging after socket failure
+  this->socket_->getpeername_to(this->client_peername_);
   int err = this->socket_->setblocking(false);
   if (err != 0) {
     state_ = State::FAILED;
diff --git a/esphome/components/api/api_frame_helper.h b/esphome/components/api/api_frame_helper.h
index 37e972e205e..2364aca4eda 100644
--- a/esphome/components/api/api_frame_helper.h
+++ b/esphome/components/api/api_frame_helper.h
@@ -86,6 +86,8 @@ class APIFrameHelper {
 
   // Get client name (null-terminated)
   const char *get_client_name() const { return this->client_name_; }
+  // Get client peername/IP (null-terminated, cached at init time for availability after socket failure)
+  const char *get_client_peername() const { return this->client_peername_; }
   // Set client name from buffer with length (truncates if needed)
   void set_client_name(const char *name, size_t len) {
     size_t copy_len = std::min(len, sizeof(this->client_name_) - 1);
@@ -98,7 +100,6 @@ class APIFrameHelper {
   virtual APIError read_packet(ReadPacketBuffer *buffer) = 0;
   bool can_write_without_blocking() { return this->state_ == State::DATA && this->tx_buf_count_ == 0; }
   int getpeername(struct sockaddr *addr, socklen_t *addrlen) { return socket_->getpeername(addr, addrlen); }
-  size_t getpeername_to(std::span<char, socket::PEERNAME_MAX_LEN> buf) { return socket_->getpeername_to(buf); }
   APIError close() {
     state_ = State::CLOSED;
     int err = this->socket_->close();
@@ -199,6 +200,8 @@ class APIFrameHelper {
 
   // Client name buffer - stores name from Hello message or initial peername
   char client_name_[CLIENT_INFO_NAME_MAX_LEN]{};
+  // Cached peername/IP address - captured at init time for availability after socket failure
+  char client_peername_[socket::PEERNAME_MAX_LEN]{};
 
   // Group smaller types together
   uint16_t rx_buf_len_ = 0;
diff --git a/esphome/components/api/api_frame_helper_noise.cpp b/esphome/components/api/api_frame_helper_noise.cpp
index 11a399feab7..186f0428c74 100644
--- a/esphome/components/api/api_frame_helper_noise.cpp
+++ b/esphome/components/api/api_frame_helper_noise.cpp
@@ -28,12 +28,7 @@ static constexpr size_t PROLOGUE_INIT_LEN = 12;  // strlen("NoiseAPIInit")
 static constexpr size_t API_MAX_LOG_BYTES = 168;
 
 #if ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_VERY_VERBOSE
-#define HELPER_LOG(msg, ...) \
-  do { \
-    char peername__[socket::PEERNAME_MAX_LEN]; \
-    this->socket_->getpeername_to(peername__); \
-    ESP_LOGVV(TAG, "%s (%s): " msg, this->client_name_, peername__, ##__VA_ARGS__); \
-  } while (0)
+#define HELPER_LOG(msg, ...) ESP_LOGVV(TAG, "%s (%s): " msg, this->client_name_, this->client_peername_, ##__VA_ARGS__)
 #else
 #define HELPER_LOG(msg, ...) ((void) 0)
 #endif
diff --git a/esphome/components/api/api_frame_helper_plaintext.cpp b/esphome/components/api/api_frame_helper_plaintext.cpp
index 8629ca71e4c..5d1fac54c81 100644
--- a/esphome/components/api/api_frame_helper_plaintext.cpp
+++ b/esphome/components/api/api_frame_helper_plaintext.cpp
@@ -21,12 +21,7 @@ static const char *const TAG = "api.plaintext";
 static constexpr size_t API_MAX_LOG_BYTES = 168;
 
 #if ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_VERY_VERBOSE
-#define HELPER_LOG(msg, ...) \
-  do { \
-    char peername__[socket::PEERNAME_MAX_LEN]; \
-    this->socket_->getpeername_to(peername__); \
-    ESP_LOGVV(TAG, "%s (%s): " msg, this->client_name_, peername__, ##__VA_ARGS__); \
-  } while (0)
+#define HELPER_LOG(msg, ...) ESP_LOGVV(TAG, "%s (%s): " msg, this->client_name_, this->client_peername_, ##__VA_ARGS__)
 #else
 #define HELPER_LOG(msg, ...) ((void) 0)
 #endif
diff --git a/esphome/components/api/api_server.cpp b/esphome/components/api/api_server.cpp
index ade9bcae238..71bccc13371 100644
--- a/esphome/components/api/api_server.cpp
+++ b/esphome/components/api/api_server.cpp
@@ -187,9 +187,7 @@ void APIServer::loop() {
 
     // Rare case: handle disconnection
 #ifdef USE_API_CLIENT_DISCONNECTED_TRIGGER
-    char peername_buf[socket::PEERNAME_MAX_LEN];
-    client->get_peername_to(peername_buf);
-    this->client_disconnected_trigger_->trigger(std::string(client->get_name()), std::string(peername_buf));
+    this->client_disconnected_trigger_->trigger(std::string(client->get_name()), std::string(client->get_peername()));
 #endif
 #ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
     this->unregister_active_action_calls_for_connection(client.get());
diff --git a/esphome/components/voice_assistant/voice_assistant.cpp b/esphome/components/voice_assistant/voice_assistant.cpp
index e91e1b11cbd..6063647accf 100644
--- a/esphome/components/voice_assistant/voice_assistant.cpp
+++ b/esphome/components/voice_assistant/voice_assistant.cpp
@@ -431,11 +431,8 @@ void VoiceAssistant::client_subscription(api::APIConnection *client, bool subscr
 
   if (this->api_client_ != nullptr) {
     ESP_LOGE(TAG, "Multiple API Clients attempting to connect to Voice Assistant");
-    char peername[socket::PEERNAME_MAX_LEN];
-    this->api_client_->get_peername_to(peername);
-    ESP_LOGE(TAG, "Current client: %s (%s)", this->api_client_->get_name(), peername);
-    client->get_peername_to(peername);
-    ESP_LOGE(TAG, "New client: %s (%s)", client->get_name(), peername);
+    ESP_LOGE(TAG, "Current client: %s (%s)", this->api_client_->get_name(), this->api_client_->get_peername());
+    ESP_LOGE(TAG, "New client: %s (%s)", client->get_name(), client->get_peername());
     return;
   }