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  • Statistics
    Domains: 303,913,843
    Organizations: 3,520,879
    Public networks: 10,858,685
    Geolocations: 7,211,516
    Autonomous Systems: 112,717

CERFnet

IPv4 IPv6
Country: United States United States

Assigned AS: N/A
Updated: 03 July 2025

We found 31 IPv4 networks operated by this organization:
Results sorted by network size.

United States CERFnet
ATTENS-SEA1-1

CIDR: 12.129.0.0/18
IP Range: 12.129.0.0 - 12.129.63.255
Block size: 16,384

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United States CERFnet
ATTENS-ATL-1

CIDR: 12.129.64.0/18
IP Range: 12.129.64.0 - 12.129.127.255
Block size: 16,384

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United States CERFnet
ATTENS-LAX1-1

CIDR: 12.129.192.0/18
IP Range: 12.129.192.0 - 12.129.255.255
Block size: 16,384

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United States CERFnet
ATTENS-BOS1-1

CIDR: 12.130.0.0/18
IP Range: 12.130.0.0 - 12.130.63.255
Block size: 16,384

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United States CERFnet
ATTENS-SJC1-2

CIDR: 12.130.128.0/18
IP Range: 12.130.128.0 - 12.130.191.255
Block size: 16,384

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United States CERFnet
ATT-CERF-NET-12-130-96-0

CIDR: 12.130.96.0/19
IP Range: 12.130.96.0 - 12.130.127.255
Block size: 8,192

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United States CERFnet
CERF-WEB-NYC-2

CIDR: 209.187.176.0/20
IP Range: 209.187.176.0 - 209.187.191.255
Block size: 4,096

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United States CERFnet
ATTENS-SAN2-1

CIDR: 12.130.64.0/20
IP Range: 12.130.64.0 - 12.130.79.255
Block size: 4,096

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United States CERFnet
ATTENS-IDCBLK-1

CIDR: 12.130.80.0/20
IP Range: 12.130.80.0 - 12.130.95.255
Block size: 4,096

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United States CERFnet
CERF-DSL-NYC-3

CIDR: 209.187.8.0/21
IP Range: 209.187.8.0 - 209.187.15.255
Block size: 2,048

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United States CERFnet
CERF-DSL-BOS-1

CIDR: 209.187.120.0/21
IP Range: 209.187.120.0 - 209.187.127.255
Block size: 2,048

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United States CERFnet
CERF-DSL-BOS-2

CIDR: 209.187.144.0/21
IP Range: 209.187.144.0 - 209.187.151.255
Block size: 2,048

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United States CERFnet
CERF-DSL-CHI-2

CIDR: 209.187.192.0/21
IP Range: 209.187.192.0 - 209.187.199.255
Block size: 2,048

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United States CERFnet
CERF-ISDN2

CIDR: 199.106.78.0/24
IP Range: 199.106.78.0 - 199.106.78.255
Block size: 256

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United States CERFnet
CERF-DSL-SD-A

CIDR: 206.19.8.0/24
IP Range: 206.19.8.0 - 206.19.8.255
Block size: 256

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United States CERFnet
NETBLK-CERFNET-11

CIDR: 192.215.11.0/24
IP Range: 192.215.11.0 - 192.215.11.255
Block size: 256

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United States CERFnet
CERFNET-12

CIDR: 192.215.12.0/24
IP Range: 192.215.12.0 - 192.215.12.255
Block size: 256

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United States CERFnet
NTBLK-CERFNET-13

CIDR: 192.215.13.0/24
IP Range: 192.215.13.0 - 192.215.13.255
Block size: 256

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United States CERFnet
CERFNET-15

CIDR: 192.215.15.0/24
IP Range: 192.215.15.0 - 192.215.15.255
Block size: 256

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United States CERFnet
CERFNET-16

CIDR: 192.215.16.0/24
IP Range: 192.215.16.0 - 192.215.16.255
Block size: 256

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United States CERFnet
NETBLK-CERFNET-18

CIDR: 192.215.18.0/24
IP Range: 192.215.18.0 - 192.215.18.255
Block size: 256

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United States CERFnet
NETBLK-CERFNET-23

CIDR: 192.215.23.0/24
IP Range: 192.215.23.0 - 192.215.23.255
Block size: 256

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United States Cerfnet
CERFNET-26

CIDR: 192.215.26.0/24
IP Range: 192.215.26.0 - 192.215.26.255
Block size: 256

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United States CERFnet
DDI-COM

CIDR: 192.215.28.0/24
IP Range: 192.215.28.0 - 192.215.28.255
Block size: 256

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United States CERFnet
NETBLK-CERFNET-30

CIDR: 192.215.30.0/24
IP Range: 192.215.30.0 - 192.215.30.255
Block size: 256

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United States CERFnet
NETBLK-CERFNET-31

CIDR: 192.215.31.0/24
IP Range: 192.215.31.0 - 192.215.31.255
Block size: 256

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United States CERFnet
NETBLK-CERFNET-34

CIDR: 192.215.34.0/24
IP Range: 192.215.34.0 - 192.215.34.255
Block size: 256

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United States CERFnet
NETBLK-CERFNET-35

CIDR: 192.215.35.0/24
IP Range: 192.215.35.0 - 192.215.35.255
Block size: 256

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United States CERFnet
ATT-CERF-NET-12-37-32-128

CIDR: 12.37.32.128/25
IP Range: 12.37.32.128 - 12.37.32.255
Block size: 128

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United States Daniel Garza
ATTWH-12-129-196-224-29-2303141431

CIDR: 12.129.196.224/29
IP Range: 12.129.196.224 - 12.129.196.231
Block size: 8

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United States CERFnet
12-130-132-0-29

CIDR: 12.130.132.0/29
IP Range: 12.130.132.0 - 12.130.132.7
Block size: 8

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