diff --git a/apps/t3/app/src/main/java/org/onosproject/t3/api/HostNib.java b/apps/t3/app/src/main/java/org/onosproject/t3/api/HostNib.java
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+++ b/apps/t3/app/src/main/java/org/onosproject/t3/api/HostNib.java
@@ -0,0 +1,127 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.t3.api;
+
+import com.google.common.collect.ImmutableSet;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.Host;
+import org.onosproject.net.HostId;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * Represents Network Information Base (NIB) for hosts
+ * and supports alternative functions to
+ * {@link org.onosproject.net.host.HostService} for offline data.
+ */
+public class HostNib {
+
+    // TODO with method optimization, store into subdivided structures at the first load
+    private Set<Host> hosts;
+
+    // use the singleton helper to create the instance
+    protected HostNib() {
+    }
+
+    /**
+     * Sets a set of hosts.
+     *
+     * @param hosts host set
+     */
+    public void setHosts(Set<Host> hosts) {
+        this.hosts = hosts;
+    }
+
+    /**
+     * Returns the set of hosts.
+     *
+     * @return host set
+     */
+    public Set<Host> getHosts() {
+        return ImmutableSet.copyOf(hosts);
+    }
+
+    /**
+     * Returns the host with the specified identifier.
+     *
+     * @param hostId host identifier
+     * @return host or null if one with the given identifier is not known
+     */
+    public Host getHost(HostId hostId) {
+        return hosts.stream()
+                .filter(host -> host.id().equals(hostId))
+                .findFirst().orElse(null);
+    }
+
+    /**
+     * Returns the set of hosts whose most recent location is the specified
+     * connection point.
+     *
+     * @param connectPoint connection point
+     * @return set of hosts connected to the connection point
+     */
+    public Set<Host> getConnectedHosts(ConnectPoint connectPoint) {
+        // TODO extend this method to support matching on auxLocations as well
+        Set<Host> connectedHosts = hosts.stream()
+                .filter(host -> host.locations().contains(connectPoint))
+                .collect(Collectors.toSet());
+        return connectedHosts != null ? ImmutableSet.copyOf(connectedHosts) : ImmutableSet.of();
+    }
+
+    /**
+     * Returns the set of hosts that have the specified IP address.
+     *
+     * @param ip ip address
+     * @return set of hosts with the given IP
+     */
+    public Set<Host> getHostsByIp(IpAddress ip) {
+        Set<Host> hostsByIp = hosts.stream()
+                .filter(host -> host.ipAddresses().contains(ip))
+                .collect(Collectors.toSet());
+        return hostsByIp != null ? ImmutableSet.copyOf(hostsByIp) : ImmutableSet.of();
+    }
+
+    /**
+     * Returns the set of hosts that have the specified MAC address.
+     *
+     * @param mac mac address
+     * @return set of hosts with the given mac
+     */
+    public Set<Host> getHostsByMac(MacAddress mac) {
+        Set<Host> hostsByMac = hosts.stream()
+                .filter(host -> host.mac().equals(mac))
+                .collect(Collectors.toSet());
+        return hostsByMac != null ? ImmutableSet.copyOf(hostsByMac) : ImmutableSet.of();
+    }
+
+    /**
+     * Returns the singleton instance of hosts NIB.
+     *
+     * @return instance of hosts NIB
+     */
+    public static HostNib getInstance() {
+        return HostNib.SingletonHelper.INSTANCE;
+    }
+
+    private static class SingletonHelper {
+        private static final HostNib INSTANCE = new HostNib();
+    }
+
+}