diff --git a/install.sh b/install.sh
index b0beed1..ef6e35d 100755
--- a/install.sh
+++ b/install.sh
@@ -79,7 +79,56 @@ log_error()   { printf "\n${RED}${BOLD}ERROR:${RESET}${RED} %s${RESET}\n" "$1" >
 
 die() { log_error "$1"; exit 1; }
 
-TOTAL_STEPS=7
+# ---------------------------------------------------------------------------
+# Interactive prompt helpers (use /dev/tty so they work even with piped stdin)
+# ---------------------------------------------------------------------------
+prompt() {
+    # prompt <label> <default> <var>
+    local _label="$1" _default="$2" _var="$3" _inp=''
+    if [ -n "$_default" ]; then
+        printf "  %s [%s]: " "$_label" "$_default" >/dev/tty
+    else
+        printf "  %s: " "$_label" >/dev/tty
+    fi
+    read -r _inp </dev/tty || true
+    [ -z "$_inp" ] && _inp="$_default"
+    eval "${_var}=\${_inp}"
+}
+
+prompt_secret() {
+    # prompt_secret <label> <var>
+    local _label="$1" _var="$2" _inp=''
+    printf "  %s: " "$_label" >/dev/tty
+    stty -echo </dev/tty 2>/dev/null || true
+    read -r _inp </dev/tty || true
+    stty echo  </dev/tty 2>/dev/null || true
+    printf "\n" >/dev/tty
+    eval "${_var}=\${_inp}"
+}
+
+verify_cf_token() {
+    local _token="$1" _result=''
+    _result=$(curl -fsSm 10 \
+        -H "Authorization: Bearer ${_token}" \
+        "https://api.cloudflare.com/client/v4/user/tokens/verify" 2>/dev/null) || true
+    echo "$_result" | grep -q '"success":true'
+}
+
+verify_duckdns() {
+    local _sub="$1" _token="$2" _result=''
+    _result=$(curl -fsSm 10 \
+        "https://www.duckdns.org/update?domains=${_sub}&token=${_token}&ip=" 2>/dev/null) || true
+    [ "$_result" = "OK" ]
+}
+
+check_pic_ngo_available() {
+    local _name="$1" _result=''
+    _result=$(curl -fsSm 10 \
+        "https://ddns.pic.ngo/api/v1/check/${_name}" 2>/dev/null) || true
+    echo "$_result" | grep -q '"available":true'
+}
+
+TOTAL_STEPS=8
 
 # ---------------------------------------------------------------------------
 # Must run as root
@@ -253,13 +302,182 @@ chown -R "${REPO_OWNER}:${REPO_OWNER}" "$PIC_DIR"
 git config --system --add safe.directory "$PIC_DIR" 2>/dev/null || true
 
 # ---------------------------------------------------------------------------
-# Step 5 — Run make install
+# Step 5 — Configure cell identity
 # ---------------------------------------------------------------------------
-log_step 5 "Running 'make install'..."
+log_step 5 "Configuring cell identity..."
+
+if [ ! -c /dev/tty ]; then
+    die "No interactive terminal available. Re-run with a real terminal (not piped)."
+fi
+
+printf "\n" >/dev/tty
+
+# ── Cell name ──────────────────────────────────────────────────────────────
+PIC_CELL_NAME=''
+while true; do
+    prompt "Cell name (e.g. myhome, alice, lab)" "" PIC_CELL_NAME
+    if echo "$PIC_CELL_NAME" | grep -qE '^[a-z][a-z0-9-]{1,30}$'; then
+        break
+    fi
+    log_warn "Must start with a letter, use only lowercase letters/digits/hyphens, 2–31 chars."
+done
+
+# ── Domain / DDNS choice ───────────────────────────────────────────────────
+printf "\n" >/dev/tty
+printf "  How will your cell be publicly reachable?\n" >/dev/tty
+printf "    1) pic.ngo subdomain  — free, %s.pic.ngo, fully automatic HTTPS\n" "$PIC_CELL_NAME" >/dev/tty
+printf "    2) Cloudflare DNS-01  — your own domain (must use Cloudflare nameservers)\n" >/dev/tty
+printf "    3) DuckDNS            — free *.duckdns.org subdomain\n" >/dev/tty
+printf "    4) HTTP-01 (any)      — any domain, port 80 must be publicly reachable\n" >/dev/tty
+printf "    5) Local only         — no public domain, LAN/VPN access only\n" >/dev/tty
+printf "\n" >/dev/tty
+
+PIC_DOMAIN_MODE=''
+_choice=''
+while true; do
+    prompt "Choice" "1" _choice
+    case "$_choice" in
+        1) PIC_DOMAIN_MODE="pic_ngo";    break ;;
+        2) PIC_DOMAIN_MODE="cloudflare"; break ;;
+        3) PIC_DOMAIN_MODE="duckdns";    break ;;
+        4) PIC_DOMAIN_MODE="http01";     break ;;
+        5) PIC_DOMAIN_MODE="lan";        break ;;
+        *) log_warn "Enter a number from 1 to 5." ;;
+    esac
+done
+
+PIC_DOMAIN_NAME=''
+PIC_CF_TOKEN=''
+PIC_DDK_TOKEN=''
+PIC_DDK_SUB=''
+
+# ── pic.ngo ────────────────────────────────────────────────────────────────
+if [ "$PIC_DOMAIN_MODE" = "pic_ngo" ]; then
+    PIC_DOMAIN_NAME="${PIC_CELL_NAME}.pic.ngo"
+    printf "  Checking name availability at pic.ngo..." >/dev/tty
+    if check_pic_ngo_available "$PIC_CELL_NAME"; then
+        printf " available\n" >/dev/tty
+        log_ok "Will register: ${PIC_DOMAIN_NAME}"
+    else
+        printf "\n" >/dev/tty
+        log_warn "${PIC_DOMAIN_NAME} may already be taken or the server is unreachable."
+        log_warn "Registration will be retried at first boot."
+    fi
+fi
+
+# ── Cloudflare ─────────────────────────────────────────────────────────────
+if [ "$PIC_DOMAIN_MODE" = "cloudflare" ]; then
+    printf "\n" >/dev/tty
+    while true; do
+        prompt "Your domain name (e.g. home.example.com)" "" PIC_DOMAIN_NAME
+        if echo "$PIC_DOMAIN_NAME" | grep -qiE '^[a-z0-9]([a-z0-9-]*[a-z0-9])?(\.[a-z]{2,})+$'; then
+            break
+        fi
+        log_warn "Enter a valid fully-qualified domain name (e.g. home.example.com)."
+    done
+    printf "\n" >/dev/tty
+    printf "  Create an API token at: Cloudflare Dashboard → My Profile → API Tokens\n" >/dev/tty
+    printf "  Required permission: Zone / DNS / Edit  (set to all zones or your specific zone)\n" >/dev/tty
+    printf "\n" >/dev/tty
+    _attempts=0
+    while true; do
+        prompt_secret "Cloudflare API token" PIC_CF_TOKEN
+        if [ -z "$PIC_CF_TOKEN" ]; then
+            log_warn "Token cannot be empty."
+            continue
+        fi
+        printf "  Verifying token with Cloudflare..." >/dev/tty
+        if verify_cf_token "$PIC_CF_TOKEN"; then
+            printf " valid\n" >/dev/tty
+            log_ok "Cloudflare token verified"
+            break
+        fi
+        printf " invalid\n" >/dev/tty
+        _attempts=$((_attempts + 1))
+        log_warn "Verification failed — check the token has Zone / DNS / Edit permission."
+        if [ "$_attempts" -ge 2 ]; then
+            log_warn "Token failed twice. You can still continue — it will be tested again at first boot."
+            prompt "Press Enter to continue with this token, or Ctrl-C to abort and re-run" "" _dummy
+            break
+        fi
+    done
+fi
+
+# ── DuckDNS ────────────────────────────────────────────────────────────────
+if [ "$PIC_DOMAIN_MODE" = "duckdns" ]; then
+    printf "\n" >/dev/tty
+    printf "  First create a subdomain at duckdns.org, then enter the details below.\n" >/dev/tty
+    printf "\n" >/dev/tty
+    while true; do
+        prompt "DuckDNS subdomain (e.g. myhome  →  myhome.duckdns.org)" "" PIC_DDK_SUB
+        if echo "$PIC_DDK_SUB" | grep -qE '^[a-z0-9][a-z0-9-]*$'; then
+            break
+        fi
+        log_warn "Subdomain must be lowercase letters, digits, and hyphens only."
+    done
+    PIC_DOMAIN_NAME="${PIC_DDK_SUB}.duckdns.org"
+    printf "\n" >/dev/tty
+    _attempts=0
+    while true; do
+        prompt_secret "DuckDNS token (from duckdns.org account page)" PIC_DDK_TOKEN
+        if [ -z "$PIC_DDK_TOKEN" ]; then
+            log_warn "Token cannot be empty."
+            continue
+        fi
+        printf "  Verifying token with DuckDNS..." >/dev/tty
+        if verify_duckdns "$PIC_DDK_SUB" "$PIC_DDK_TOKEN"; then
+            printf " valid\n" >/dev/tty
+            log_ok "DuckDNS token verified  (${PIC_DOMAIN_NAME})"
+            break
+        fi
+        printf " invalid\n" >/dev/tty
+        _attempts=$((_attempts + 1))
+        log_warn "Verification failed — make sure the subdomain exists at duckdns.org and the token is correct."
+        if [ "$_attempts" -ge 2 ]; then
+            log_warn "Token failed twice. You can still continue — it will be tested again at first boot."
+            prompt "Press Enter to continue with this token, or Ctrl-C to abort and re-run" "" _dummy
+            break
+        fi
+    done
+fi
+
+# ── HTTP-01 ────────────────────────────────────────────────────────────────
+if [ "$PIC_DOMAIN_MODE" = "http01" ]; then
+    printf "\n" >/dev/tty
+    while true; do
+        prompt "Your domain name (e.g. home.example.com)" "" PIC_DOMAIN_NAME
+        if echo "$PIC_DOMAIN_NAME" | grep -qiE '^[a-z0-9]([a-z0-9-]*[a-z0-9])?(\.[a-z]{2,})+$'; then
+            break
+        fi
+        log_warn "Enter a valid fully-qualified domain name."
+    done
+    printf "\n" >/dev/tty
+    log_warn "HTTP-01 requires port 80 to be publicly reachable from the internet."
+    log_warn "Make sure your router forwards port 80 to this machine before completing setup."
+fi
+
+# ── Local only ─────────────────────────────────────────────────────────────
+if [ "$PIC_DOMAIN_MODE" = "lan" ]; then
+    log_ok "Local-only mode — no public domain or DDNS will be configured."
+fi
+
+printf "\n" >/dev/tty
+log_ok "Identity configured: cell=${PIC_CELL_NAME}  mode=${PIC_DOMAIN_MODE}${PIC_DOMAIN_NAME:+  domain=${PIC_DOMAIN_NAME}}"
+
+# ---------------------------------------------------------------------------
+# Step 6 — Run make install
+# ---------------------------------------------------------------------------
+log_step 6 "Running 'make install'..."
 
 cd "$PIC_DIR"
 
-if ! make install 2>&1 | sed 's/^/  /'; then
+if ! CELL_NAME="$PIC_CELL_NAME" \
+      DOMAIN_MODE="$PIC_DOMAIN_MODE" \
+      CELL_DOMAIN_NAME="${PIC_DOMAIN_NAME:-}" \
+      CLOUDFLARE_API_TOKEN="${PIC_CF_TOKEN:-}" \
+      DUCKDNS_TOKEN="${PIC_DDK_TOKEN:-}" \
+      DUCKDNS_SUBDOMAIN="${PIC_DDK_SUB:-}" \
+      make install 2>&1 | sed 's/^/  /'; then
     die "'make install' failed. Check the output above."
 fi
 
@@ -270,9 +488,9 @@ chown -R "${REPO_OWNER}:${REPO_OWNER}" "$PIC_DIR"
 log_ok "'make install' complete"
 
 # ---------------------------------------------------------------------------
-# Step 6 — Start core services
+# Step 7 — Start core services
 # ---------------------------------------------------------------------------
-log_step 6 "Starting core services..."
+log_step 7 "Starting core services..."
 
 cd "$PIC_DIR"
 
@@ -283,9 +501,9 @@ fi
 log_ok "Core services started"
 
 # ---------------------------------------------------------------------------
-# Step 7 — Health check + print wizard URL
+# Step 8 — Health check + print wizard URL
 # ---------------------------------------------------------------------------
-log_step 7 "Waiting for API health check (up to ${API_HEALTH_TIMEOUT}s)..."
+log_step 8 "Waiting for API health check (up to ${API_HEALTH_TIMEOUT}s)..."
 
 ELAPSED=0
 HEALTHY=0
@@ -323,7 +541,14 @@ printf "\n${GREEN}${BOLD}=======================================================
 printf "${GREEN}${BOLD}  PIC installed successfully!${RESET}\n"
 printf "${GREEN}${BOLD}============================================================${RESET}\n"
 printf "\n"
-printf "  Open the setup wizard at:\n"
+printf "  Cell:   ${BOLD}%s${RESET}\n" "$PIC_CELL_NAME"
+if [ -n "$PIC_DOMAIN_NAME" ]; then
+    printf "  Domain: ${BOLD}%s${RESET}  (%s)\n" "$PIC_DOMAIN_NAME" "$PIC_DOMAIN_MODE"
+else
+    printf "  Domain: %s\n" "local only (LAN/VPN)"
+fi
+printf "\n"
+printf "  Open the setup wizard to set your admin password and choose services:\n"
 printf "\n"
 printf "  ${BOLD}http://${HOST_IP}:${WEBUI_PORT}/setup${RESET}\n"
 printf "\n"
diff --git a/scripts/setup_cell.py b/scripts/setup_cell.py
index ee165c5..9f1ada8 100644
--- a/scripts/setup_cell.py
+++ b/scripts/setup_cell.py
@@ -169,7 +169,8 @@ def write_wg0_conf(private_key: str, address: str, port: int):
     print(f'[CREATED] config/wireguard/wg0.conf  address={address}  port={port}')
 
 
-def write_cell_config(cell_name: str, domain: str, port: int):
+def write_cell_config(cell_name: str, domain: str, port: int,
+                      domain_mode: str, domain_name: str) -> None:
     cfg_path = os.path.join(ROOT, 'config', 'api', 'cell_config.json')
     if os.path.exists(cfg_path):
         try:
@@ -179,23 +180,46 @@ def write_cell_config(cell_name: str, domain: str, port: int):
                 return
         except Exception:
             pass
-    config = {
-        '_identity': {
-            'cell_name': cell_name,
-            'domain': domain,
-            'ip_range': '172.20.0.0/16',
-            'wireguard_port': port,
-        },
-        'ddns': {
+
+    ddns: dict = {}
+    if domain_mode == 'pic_ngo':
+        ddns = {
             'provider': 'pic_ngo',
             'api_base_url': DDNS_URL.replace('/api/v1', ''),
             'totp_secret': DDNS_TOTP_SECRET,
             'enabled': True,
+        }
+    elif domain_mode == 'cloudflare':
+        ddns = {'provider': 'cloudflare', 'enabled': True}
+        if CLOUDFLARE_TOKEN:
+            ddns['api_token'] = CLOUDFLARE_TOKEN
+    elif domain_mode == 'duckdns':
+        ddns = {'provider': 'duckdns', 'enabled': True}
+        if DUCKDNS_TOKEN:
+            ddns['token'] = DUCKDNS_TOKEN
+        if DUCKDNS_SUBDOMAIN:
+            ddns['subdomain'] = DUCKDNS_SUBDOMAIN
+    elif domain_mode == 'http01':
+        ddns = {'provider': 'http01', 'enabled': True}
+    else:  # lan
+        ddns = {'provider': 'none', 'enabled': False}
+
+    config = {
+        '_identity': {
+            'cell_name': cell_name,
+            'domain': domain,
+            'domain_mode': domain_mode,
+            'domain_name': domain_name,
+            'ip_range': '172.20.0.0/16',
+            'wireguard_port': port,
         },
+        'ddns': ddns,
     }
     with open(cfg_path, 'w') as f:
         json.dump(config, f, indent=2)
-    print(f'[CREATED] config/api/cell_config.json  name={cell_name}  domain={domain}')
+    os.chmod(cfg_path, 0o600)
+    print(f'[CREATED] config/api/cell_config.json  name={cell_name}  mode={domain_mode}'
+          + (f'  domain={domain_name}' if domain_name else ''))
 
 
 def write_compose_env(ip_range: str):
@@ -244,8 +268,13 @@ def ensure_session_secret():
     print('[CREATED] data/api/.session_secret')
 
 
-DDNS_URL = os.environ.get('DDNS_URL', 'https://ddns.pic.ngo/api/v1')
-DDNS_TOTP_SECRET = os.environ.get('DDNS_TOTP_SECRET', 'S6UMA464YIKM74QHXWL5WELDIO3HFZ6K')
+DDNS_URL         = os.environ.get('DDNS_URL',             'https://ddns.pic.ngo/api/v1')
+DDNS_TOTP_SECRET = os.environ.get('DDNS_TOTP_SECRET',    'S6UMA464YIKM74QHXWL5WELDIO3HFZ6K')
+DOMAIN_MODE      = os.environ.get('DOMAIN_MODE',          'pic_ngo')
+CELL_DOMAIN_NAME = os.environ.get('CELL_DOMAIN_NAME',     '')
+CLOUDFLARE_TOKEN = os.environ.get('CLOUDFLARE_API_TOKEN', '')
+DUCKDNS_TOKEN    = os.environ.get('DUCKDNS_TOKEN',        '')
+DUCKDNS_SUBDOMAIN= os.environ.get('DUCKDNS_SUBDOMAIN',   '')
 
 
 def register_with_ddns(cell_name: str) -> None:
@@ -353,15 +382,28 @@ def bootstrap_admin_password():
 
 
 def main():
-    cell_name = os.environ.get('CELL_NAME', 'mycell')
-    domain = os.environ.get('CELL_DOMAIN', 'cell')
+    cell_name   = os.environ.get('CELL_NAME', 'mycell')
+    domain_mode = DOMAIN_MODE  # module-level, read from env
+    domain_name = CELL_DOMAIN_NAME
+
+    # Derive the legacy 'domain' TLD field and fill in domain_name if empty
+    if domain_mode == 'pic_ngo':
+        domain = 'pic.ngo'
+        if not domain_name:
+            domain_name = f'{cell_name}.pic.ngo'
+    elif domain_mode == 'lan':
+        domain = os.environ.get('CELL_DOMAIN', 'cell')
+        domain_name = ''
+    else:
+        # cloudflare / duckdns / http01 — domain_name is the full FQDN
+        domain = domain_name
+
     vpn_address = os.environ.get('VPN_ADDRESS', '10.0.0.1/24')
-    wg_port = int(os.environ.get('WG_PORT', '51820'))
-    # Prefer existing config ip_range over env var so `make setup` is safe to re-run
-    ip_range = os.environ.get('CELL_IP_RANGE') or _read_existing_ip_range() or '172.20.0.0/16'
+    wg_port     = int(os.environ.get('WG_PORT', '51820'))
+    ip_range    = os.environ.get('CELL_IP_RANGE') or _read_existing_ip_range() or '172.20.0.0/16'
 
     print('--- Personal Internet Cell: Setup ---')
-    print(f'    cell={cell_name}  domain={domain}  vpn={vpn_address}  port={wg_port}')
+    print(f'    cell={cell_name}  mode={domain_mode}  domain={domain_name or "(lan)"}  vpn={vpn_address}  port={wg_port}')
     print()
 
     for d in REQUIRED_DIRS:
@@ -372,12 +414,14 @@ def main():
     ensure_caddy_ca_cert()
     priv, _pub = generate_wg_keys()
     write_wg0_conf(priv, vpn_address, wg_port)
-    write_cell_config(cell_name, domain, wg_port)
+    write_cell_config(cell_name, domain, wg_port, domain_mode, domain_name)
     write_compose_env(ip_range)
     write_caddy_config(ip_range, cell_name, domain)
     ensure_session_secret()
     bootstrap_admin_password()
-    register_with_ddns(cell_name)
+
+    if domain_mode == 'pic_ngo':
+        register_with_ddns(cell_name)
 
     print()
     print('--- Setup complete! Run: make start ---')