Live IP Intelligence Report
IP Lookup: Get Comprehensive IP Address Details
YOUR PUBLIC IP
128.2.0.1
Clean Connection
Threat: Safe
Country
United States of America
Code: US
City
Bloomfield
Pennsylvania
Timezone
-04:00
ISP
Carnegie Mellon University
Zip Code
15224
Offline IP2Location Database
Geolocation Mapping
Proxy / VPN Detection
ASN & Network Data
Reverse Lookup
Geolocation Intelligence
Precise location data from offline IP2Location database
Country
United States of America
ISO: US
Region / State
Pennsylvania
City
Bloomfield
Zip / Postal Code
15224
Timezone
-04:00
Calculating...
Coordinates
40.4609, -79.9508
Lat / Long (approximate)
Interactive Location Map
Approximate geographic position of this IP address
Latitude
40.460941°
Longitude
-79.950813°
Security & Threat Analysis
VPN, Proxy, Tor, and threat intelligence scan
✓ Clean & Secure Connection
Threat: Safe
Threat Level
5%
Proxy / VPN
None
Proxy Type
N/A
Threat Classification
Safe
Connection Type
N/A
Network & ASN Details
Autonomous System, ISP, domain and routing information
AS Number
AS9
Autonomous System
network_info@ipconsole:~$
ISP / Provider
Carnegie Mellon University
AS Name
Carnegie Mellon University
Domain
cmu.edu
Usage Type
Private / Reserved
IP Version
IPv4
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Browser & Device Fingerprint
Technical details detected from your browser session
Client Fingerprint Data
Browser
Detecting...
Operating System
Detecting...
Platform
Detecting...
Screen Resolution
Detecting...
Color Depth
Detecting...
Language
Detecting...
Timezone (Browser)
Detecting...
Cookies Enabled
Detecting...
Raw User Agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])
IP Technical Breakdown
Binary, hexadecimal and decimal representations
IP Address (Canonical)
128.2.0.1
Binary Notation
10000000.00000010.00000000.00000001
Hexadecimal
80:02:00:01
Decimal (Long)
2147614721
IP Class
Class B
IP Version
IPv4 (32-bit)
Private / Public
Public IP
About This IP Address
Automated analysis of 128.2.0.1
AI Analysis: 128.2.0.1
The IP address 128.2.0.1 is managed by Carnegie Mellon University. This IP address is used to identify devices connecting to the internet, allowing them to communicate and request data securely.
IPv4 Class B Network — Mid-Scale Enterprise & University Networks
Comprehensive analysis of your IP's network class and behavior
Class B
128.0.0.0 – 191.255.255.255
65,534 hosts
The IP address
128.2.0.1 belongs to Class B — the mid-tier IPv4 address class, designed for medium-to-large organizations. Class B networks provide over 65,000 hosts per network block, making them ideal for universities, regional ISPs, government agencies, and large enterprises. With 16,384 available networks, Class B was the backbone of institutional internet in the 1990s.
Class B Quick Reference
Address Range
128.0.0.0 – 191.255.255.255
Private / Scoped Range
172.16.0.0 – 172.31.255.255
Default Subnet Mask
255.255.0.0 (/16)
Total Networks
16,384 networks
Hosts Per Network
65,534 hosts
First Bit Pattern
10xxxxxx (leading bits = 10)
Network Structure & Address Space
01/06
Class B addresses use the first two octets (16 bits) to identify the network and the last two octets (16 bits) for hosts. This gives each Class B network block exactly 65,534 usable host addresses.
Structure:
The first two bits are always 10, which constrains the first octet to values 128–191. Class B was designed as the 'Goldilocks' zone — large enough for institutional networks but not so large as to be wasteful. A single university, hospital network, or regional telco fits perfectly within a Class B /16 allocation.
Structure:
[Network].[Network].[Host].[Host]The first two bits are always 10, which constrains the first octet to values 128–191. Class B was designed as the 'Goldilocks' zone — large enough for institutional networks but not so large as to be wasteful. A single university, hospital network, or regional telco fits perfectly within a Class B /16 allocation.
Private Class B Addresses (172.16.0.0/12)
02/06
RFC 1918 reserves a range within Class B for private use: 172.16.0.0 to 172.31.255.255 (technically a /12 block spanning 16 Class B networks).
This private range provides 1,048,576 addresses — commonly used by medium-sized corporate networks, Docker container networks, VPN tunnels, and some cloud providers for internal subnet allocation.
Common usage: Docker's default bridge network uses 172.17.0.0/16. Many corporate VPNs assign clients addresses in the 172.16–172.31 range to avoid conflicts with home networks.
This private range provides 1,048,576 addresses — commonly used by medium-sized corporate networks, Docker container networks, VPN tunnels, and some cloud providers for internal subnet allocation.
Common usage: Docker's default bridge network uses 172.17.0.0/16. Many corporate VPNs assign clients addresses in the 172.16–172.31 range to avoid conflicts with home networks.
Class B Subnetting with /16 through /24
03/06
Class B networks are typically subnetted into smaller /24 blocks (254 hosts each) for departmental segmentation:
| CIDR | Subnet Mask | Hosts | Subnets from /16 |
| /16 | 255.255.0.0 | 65,534 | 1 (full block) |
| /18 | 255.255.192.0 | 16,382 | 4 subnets |
| /24 | 255.255.255.0 | 254 | 256 subnets |
| /28 | 255.255.255.240 | 14 | 4,096 subnets |
Famous Class B Allocations
04/06
Many prestigious universities and early internet institutions were allocated Class B blocks during the 1980s:
128.2.0.0/16
Carnegie Mellon Univ.
Carnegie Mellon Univ.
130.132.0.0/16
Yale University
Yale University
128.84.0.0/16
Cornell University
Cornell University
128.112.0.0/16
Princeton University
Princeton University
Security & Class B Networks
05/06
Class B networks face several security considerations:
- VLAN Segmentation: 65,000+ hosts in a single broadcast domain is dangerous — Class B networks should be segmented into VLANs
- 172.16.x.x Leakage: Private Class B addresses should never appear in public routing tables — firewall rules must prevent this
- Scanning Exposure: A /16 block (65,536 addresses) can be scanned by tools like nmap in under 60 seconds on a fast connection
Class B in the CIDR Era
06/06
Before CIDR (1993), organizations received entire /16 blocks regardless of their actual needs — often leading to massive waste. A company needing 1,000 IPs would receive 65,534. CIDR eliminated class boundaries, allowing more efficient allocation. Today, what was once called a 'Class B network' is simply a /16 prefix in CIDR notation.
Class B — Frequently Asked Questions
Common questions about Class B IP addresses, answered
The two leading bits (10) of the first octet identify the address as Class B. The remaining 14 bits of the first two octets form the network ID, giving 2^14 = 16,384 network addresses. The last 16 bits (two octets) identify hosts, yielding 65,536 - 2 = 65,534 usable host addresses per network.
RFC 1918 reserves 172.16.0.0 through 172.31.255.255 (a /12 range) as private Class B space. This covers 16 contiguous /16 blocks. Common uses include Docker networks (172.17.0.0/16), corporate VPNs, and cloud provider internal subnets.
It depends on the network size. Class B (/16) is suitable for large organizations needing up to 65,534 hosts, while Class C (/24) suits smaller offices with up to 254 hosts. Modern networks use CIDR, so you'd request a /16, /20, or /22 prefix based on actual need, without strict class boundaries.
Historically: universities (MIT, Harvard, Cornell), government agencies, regional ISPs, and mid-size corporations. In the modern era, ISPs receive Class B allocations from RIRs for residential broadband, and cloud providers use Class B ranges internally for VPC networking.
A standard Class B /16 network supports 65,534 usable host addresses (65,536 total minus network address and broadcast address). In practice, with VLANs and subnetting, this is further divided into /24 or /26 blocks for department-level management.
If it falls between 172.16.0.0 and 172.31.255.255, it's a private Class B address (RFC 1918) — meaning your device is behind NAT, typically in a corporate network, cloud VPC, or VPN. Addresses outside this range (like 172.0.x.x or 172.32.x.x) are public Class B addresses.
Explore Other IP Classes
Lookup a real example IP from each class to see how data differs
Class A
Enterprise / ISP Scale
1.0.0.0 – 126.255.255.255
Class A Private
RFC 1918 — Internal Network
10.0.0.0 – 10.255.255.255
Class B
University / Mid Enterprise
128.0.0.0 – 191.255.255.255
Class B Private
RFC 1918 — Corporate / Docker
172.16.0.0 – 172.31.255.255
Class C
Home & ISP Broadband
192.0.0.0 – 223.255.255.255
Class C Private
RFC 1918 — Home Router
192.168.0.0 – 192.168.255.255
Class D
Multicast — Routing Protocols
224.0.0.0 – 239.255.255.255
IPv6
Next-Gen Internet Protocol
2001::/32 — Public Global