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IP ranges

Zayo IP ranges

Every IPv4 and IPv6 range that Zayo (AS6461) currently announces on the internet, with CIDR and start/end IP, free to download as TXT or CSV. Data snapshot: 2026-11-02.

Zayo announces 249 IPv4 prefixes covering 1,761,536 addresses, and 13 IPv6 prefixes, through AS6461. The lists below are a snapshot of 2026-11-02 taken from the public BGP routing table, sorted by address and kept as announced.

ASNAS6461
IPv4 prefixes249
IPv4 addresses1,761,536Overlaps are counted once
IPv6 prefixes13
Data snapshot

Download the complete list

The complete list has 262 ranges (IPv4 and IPv6). TXT has one CIDR per line; CSV has the columns cidr, version, start_ip, end_ip and addresses.

Download TXTDownload CSVIPv4 only (TXT)IPv6 only (TXT)

Zayo IPv4 ranges

IPv4 ranges announced by Zayo: CIDR, start and end IP, address count
CIDRStart IP – end IPAddresses
23.139.176.0/2423.139.176.0–23.139.176.255256
31.99.0.0/1831.99.0.0–31.99.63.25516,384
45.33.128.0/2045.33.128.0–45.33.143.2554,096
45.74.7.0/2445.74.7.0–45.74.7.255256
45.74.57.0/2445.74.57.0–45.74.57.255256
45.74.59.0/2445.74.59.0–45.74.59.255256
45.132.180.0/2445.132.180.0–45.132.180.255256
50.115.24.0/2450.115.24.0–50.115.24.255256
63.208.55.0/2463.208.55.0–63.208.55.255256
63.249.63.0/2463.249.63.0–63.249.63.255256
64.56.211.0/2464.56.211.0–64.56.211.255256
64.124.0.0/1764.124.0.0–64.124.127.25532,768
64.124.128.0/1964.124.128.0–64.124.159.2558,192
64.124.160.0/2064.124.160.0–64.124.175.2554,096
64.124.176.0/2164.124.176.0–64.124.183.2552,048
64.124.184.0/2264.124.184.0–64.124.187.2551,024
64.124.188.0/2364.124.188.0–64.124.189.255512
64.124.190.0/2364.124.190.0–64.124.191.255512
64.124.192.0/1864.124.192.0–64.124.255.25516,384
64.125.0.0/1664.125.0.0–64.125.255.25565,536
64.125.74.0/2464.125.74.0–64.125.74.255256
66.46.0.0/1666.46.0.0–66.46.255.25565,536
66.62.132.0/2466.62.132.0–66.62.132.255256
66.62.161.0/2466.62.161.0–66.62.161.255256
66.62.182.0/2366.62.182.0–66.62.183.255512
66.62.230.0/2466.62.230.0–66.62.230.255256
66.62.238.0/2466.62.238.0–66.62.238.255256
66.62.239.0/2466.62.239.0–66.62.239.255256
66.62.240.0/2266.62.240.0–66.62.243.2551,024
66.62.244.0/2366.62.244.0–66.62.245.255512
66.213.128.0/1966.213.128.0–66.213.159.2558,192
67.136.93.0/2467.136.93.0–67.136.93.255256
67.208.224.0/1967.208.224.0–67.208.255.2558,192
67.213.160.0/2067.213.160.0–67.213.175.2554,096
67.230.192.0/1967.230.192.0–67.230.223.2558,192
68.170.192.0/2068.170.192.0–68.170.207.2554,096
69.147.0.0/2069.147.0.0–69.147.15.2554,096
69.147.2.0/2469.147.2.0–69.147.2.255256
69.147.4.0/2469.147.4.0–69.147.4.255256
69.147.44.0/2269.147.44.0–69.147.47.2551,024
69.147.52.0/2269.147.52.0–69.147.55.2551,024
69.147.55.0/2469.147.55.0–69.147.55.255256
69.166.105.0/2469.166.105.0–69.166.105.255256
69.195.0.0/2069.195.0.0–69.195.15.2554,096
70.98.210.0/2470.98.210.0–70.98.210.255256
71.19.160.0/1971.19.160.0–71.19.191.2558,192
72.5.65.0/2472.5.65.0–72.5.65.255256
72.10.64.0/1972.10.64.0–72.10.95.2558,192
72.20.192.0/1872.20.192.0–72.20.255.25516,384
74.80.190.0/2474.80.190.0–74.80.190.255256
74.114.161.0/2474.114.161.0–74.114.161.255256
74.114.162.0/2474.114.162.0–74.114.162.255256
74.114.163.0/2474.114.163.0–74.114.163.255256
74.114.164.0/2274.114.164.0–74.114.167.2551,024
74.212.179.0/2474.212.179.0–74.212.179.255256
74.213.234.0/2474.213.234.0–74.213.234.255256
74.213.235.0/2474.213.235.0–74.213.235.255256
74.216.0.0/1674.216.0.0–74.216.255.25565,536
76.78.123.0/2476.78.123.0–76.78.123.255256
79.141.32.0/2079.141.32.0–79.141.47.2554,096
79.183.247.0/2479.183.247.0–79.183.247.255256
82.98.192.0/2182.98.192.0–82.98.199.2552,048
82.98.232.0/2182.98.232.0–82.98.239.2552,048
82.98.240.0/2082.98.240.0–82.98.255.2554,096
91.92.240.0/2491.92.240.0–91.92.240.255256
91.92.241.0/2491.92.241.0–91.92.241.255256
91.92.242.0/2491.92.242.0–91.92.242.255256
91.92.243.0/2491.92.243.0–91.92.243.255256
91.208.131.0/2491.208.131.0–91.208.131.255256
94.31.0.0/1894.31.0.0–94.31.63.25516,384
94.154.35.0/2494.154.35.0–94.154.35.255256
94.154.40.0/2494.154.40.0–94.154.40.255256
94.154.46.0/2494.154.46.0–94.154.46.255256
95.134.53.0/2495.134.53.0–95.134.53.255256
95.134.104.0/2495.134.104.0–95.134.104.255256
95.134.105.0/2495.134.105.0–95.134.105.255256
95.134.106.0/2495.134.106.0–95.134.106.255256
95.134.107.0/2495.134.107.0–95.134.107.255256
95.134.108.0/2495.134.108.0–95.134.108.255256
95.134.109.0/2495.134.109.0–95.134.109.255256
95.134.110.0/2495.134.110.0–95.134.110.255256
95.134.111.0/2495.134.111.0–95.134.111.255256
95.164.96.0/2095.164.96.0–95.164.111.2554,096
97.107.64.0/2497.107.64.0–97.107.64.255256
97.107.65.0/2497.107.65.0–97.107.65.255256
103.139.130.0/23103.139.130.0–103.139.131.255512
104.36.8.0/21104.36.8.0–104.36.15.2552,048
104.140.204.0/24104.140.204.0–104.140.204.255256
104.145.0.0/20104.145.0.0–104.145.15.2554,096
104.224.2.0/24104.224.2.0–104.224.2.255256
104.250.184.0/24104.250.184.0–104.250.184.255256
104.251.96.0/20104.251.96.0–104.251.111.2554,096
107.178.32.0/20107.178.32.0–107.178.47.2554,096
128.177.0.0/16128.177.0.0–128.177.255.25565,536
129.192.170.0/24129.192.170.0–129.192.170.255256
129.192.171.0/24129.192.171.0–129.192.171.255256
129.192.189.0/24129.192.189.0–129.192.189.255256
130.12.180.0/24130.12.180.0–130.12.180.255256
141.193.226.0/24141.193.226.0–141.193.226.255256
142.194.0.0/16142.194.0.0–142.194.255.25565,536
144.83.0.0/16144.83.0.0–144.83.255.25565,536
146.19.125.0/24146.19.125.0–146.19.125.255256
149.64.226.0/24149.64.226.0–149.64.226.255256
158.94.208.0/24158.94.208.0–158.94.208.255256
158.94.209.0/24158.94.209.0–158.94.209.255256
158.94.210.0/24158.94.210.0–158.94.210.255256
158.94.211.0/24158.94.211.0–158.94.211.255256
159.18.0.0/16159.18.0.0–159.18.255.25565,536
159.246.52.0/24159.246.52.0–159.246.52.255256
162.223.4.0/22162.223.4.0–162.223.7.2551,024
162.223.112.0/22162.223.112.0–162.223.115.2551,024
162.245.96.0/22162.245.96.0–162.245.99.2551,024
162.249.88.0/21162.249.88.0–162.249.95.2552,048
162.251.150.0/24162.251.150.0–162.251.150.255256
162.253.136.0/21162.253.136.0–162.253.143.2552,048
164.90.20.0/24164.90.20.0–164.90.20.255256
167.217.0.0/16167.217.0.0–167.217.255.25565,536
168.102.128.0/20168.102.128.0–168.102.143.2554,096
168.254.5.0/24168.254.5.0–168.254.5.255256
170.81.198.0/24170.81.198.0–170.81.198.255256
170.130.36.0/23170.130.36.0–170.130.37.255512
170.130.60.0/23170.130.60.0–170.130.61.255512
172.110.64.0/20172.110.64.0–172.110.79.2554,096
173.44.196.0/23173.44.196.0–173.44.197.255512
173.46.64.0/20173.46.64.0–173.46.79.2554,096
173.213.70.0/23173.213.70.0–173.213.71.255512
173.241.208.0/20173.241.208.0–173.241.223.2554,096
176.46.143.0/24176.46.143.0–176.46.143.255256
176.46.146.0/24176.46.146.0–176.46.146.255256
178.16.52.0/24178.16.52.0–178.16.52.255256
178.16.53.0/24178.16.53.0–178.16.53.255256
178.16.54.0/24178.16.54.0–178.16.54.255256
178.16.55.0/24178.16.55.0–178.16.55.255256
184.94.0.0/17184.94.0.0–184.94.127.25532,768
185.75.80.0/24185.75.80.0–185.75.80.255256
185.94.77.0/24185.94.77.0–185.94.77.255256
185.94.79.0/24185.94.79.0–185.94.79.255256
192.4.2.0/24192.4.2.0–192.4.2.255256
192.40.232.0/21192.40.232.0–192.40.239.2552,048
192.64.252.0/24192.64.252.0–192.64.252.255256
192.75.172.0/24192.75.172.0–192.75.172.255256
192.124.45.0/24192.124.45.0–192.124.45.255256
192.132.44.0/24192.132.44.0–192.132.44.255256
192.197.156.0/24192.197.156.0–192.197.156.255256
193.28.62.0/23193.28.62.0–193.28.63.255512
193.28.104.0/23193.28.104.0–193.28.105.255512
193.30.241.0/24193.30.241.0–193.30.241.255256
193.34.72.0/23193.34.72.0–193.34.73.255512
193.34.74.0/23193.34.74.0–193.34.75.255512
193.160.88.0/22193.160.88.0–193.160.91.2551,024
198.60.184.0/22198.60.184.0–198.60.187.2551,024
198.90.96.0/22198.90.96.0–198.90.99.2551,024
198.100.128.0/21198.100.128.0–198.100.135.2552,048
198.136.150.0/24198.136.150.0–198.136.150.255256
199.5.171.0/24199.5.171.0–199.5.171.255256
199.16.106.0/24199.16.106.0–199.16.106.255256
199.43.120.0/24199.43.120.0–199.43.120.255256
199.85.120.0/22199.85.120.0–199.85.123.2551,024
199.87.52.0/22199.87.52.0–199.87.55.2551,024
199.96.32.0/22199.96.32.0–199.96.35.2551,024
199.96.40.0/22199.96.40.0–199.96.43.2551,024
199.119.160.0/22199.119.160.0–199.119.163.2551,024
199.164.64.0/18199.164.64.0–199.164.127.25516,384
199.164.68.0/24199.164.68.0–199.164.68.255256
199.199.36.0/24199.199.36.0–199.199.36.255256
199.212.160.0/19199.212.160.0–199.212.191.2558,192
200.123.205.0/24200.123.205.0–200.123.205.255256
200.123.207.0/24200.123.207.0–200.123.207.255256
204.9.72.0/21204.9.72.0–204.9.79.2552,048
204.14.211.0/24204.14.211.0–204.14.211.255256
204.19.20.0/23204.19.20.0–204.19.21.255512
204.128.64.0/19204.128.64.0–204.128.95.2558,192
204.128.96.0/19204.128.96.0–204.128.127.2558,192
204.128.96.0/24204.128.96.0–204.128.96.255256
205.159.43.0/24205.159.43.0–205.159.43.255256
206.165.102.0/24206.165.102.0–206.165.102.255256
206.191.64.0/18206.191.64.0–206.191.127.25516,384
206.222.64.0/19206.222.64.0–206.222.95.2558,192
206.254.231.0/24206.254.231.0–206.254.231.255256
207.11.241.0/24207.11.241.0–207.11.241.255256
207.126.96.0/19207.126.96.0–207.126.127.2558,192
207.181.64.0/18207.181.64.0–207.181.127.25516,384
207.190.143.0/24207.190.143.0–207.190.143.255256
207.230.224.0/19207.230.224.0–207.230.255.2558,192
207.235.128.0/17207.235.128.0–207.235.255.25532,768
207.235.133.0/24207.235.133.0–207.235.133.255256
207.235.136.0/24207.235.136.0–207.235.136.255256
207.235.146.0/24207.235.146.0–207.235.146.255256
207.235.148.0/24207.235.148.0–207.235.148.255256
207.235.149.0/24207.235.149.0–207.235.149.255256
207.235.150.0/24207.235.150.0–207.235.150.255256
207.235.151.0/24207.235.151.0–207.235.151.255256
207.235.152.0/24207.235.152.0–207.235.152.255256
207.235.153.0/24207.235.153.0–207.235.153.255256
207.235.154.0/24207.235.154.0–207.235.154.255256
207.235.155.0/24207.235.155.0–207.235.155.255256
207.235.157.0/24207.235.157.0–207.235.157.255256
207.235.158.0/24207.235.158.0–207.235.158.255256
207.235.160.0/24207.235.160.0–207.235.160.255256
207.235.161.0/24207.235.161.0–207.235.161.255256
207.235.255.0/24207.235.255.0–207.235.255.255256
207.245.0.0/18207.245.0.0–207.245.63.25516,384
207.245.192.0/18207.245.192.0–207.245.255.25516,384
208.39.192.0/18208.39.192.0–208.39.255.25516,384
208.67.56.0/22208.67.56.0–208.67.59.2551,024
208.67.192.0/21208.67.192.0–208.67.199.2552,048
208.70.197.0/24208.70.197.0–208.70.197.255256
208.83.248.0/21208.83.248.0–208.83.255.2552,048
208.91.200.0/22208.91.200.0–208.91.203.2551,024
208.184.0.0/15208.184.0.0–208.185.255.255131,072
208.187.29.0/24208.187.29.0–208.187.29.255256
209.66.64.0/18209.66.64.0–209.66.127.25516,384
209.82.0.0/17209.82.0.0–209.82.127.25532,768
209.82.160.0/19209.82.160.0–209.82.191.2558,192
209.90.52.0/24209.90.52.0–209.90.52.255256
209.90.58.0/24209.90.58.0–209.90.58.255256
209.105.164.0/24209.105.164.0–209.105.164.255256
209.112.0.0/18209.112.0.0–209.112.63.25516,384
209.133.0.0/17209.133.0.0–209.133.127.25532,768
209.146.128.0/17209.146.128.0–209.146.255.25532,768
209.152.0.0/20209.152.0.0–209.152.15.2554,096
209.152.16.0/20209.152.16.0–209.152.31.2554,096
209.153.192.0/18209.153.192.0–209.153.255.25516,384
209.183.176.0/20209.183.176.0–209.183.191.2554,096
209.221.32.0/19209.221.32.0–209.221.63.2558,192
209.249.0.0/16209.249.0.0–209.249.255.25565,536
213.152.224.0/19213.152.224.0–213.152.255.2558,192
213.161.64.0/19213.161.64.0–213.161.95.2558,192
216.13.0.0/16216.13.0.0–216.13.255.25565,536
216.23.128.0/19216.23.128.0–216.23.159.2558,192
216.119.0.0/18216.119.0.0–216.119.63.25516,384
216.123.0.0/17216.123.0.0–216.123.127.25532,768
216.123.128.0/18216.123.128.0–216.123.191.25516,384
216.129.0.0/18216.129.0.0–216.129.63.25516,384
216.129.64.0/19216.129.64.0–216.129.95.2558,192
216.157.192.0/19216.157.192.0–216.157.223.2558,192
216.191.0.0/16216.191.0.0–216.191.255.25565,536
216.200.0.0/17216.200.0.0–216.200.127.25532,768
216.200.128.0/19216.200.128.0–216.200.159.2558,192
216.200.160.0/20216.200.160.0–216.200.175.2554,096
216.200.176.0/21216.200.176.0–216.200.183.2552,048
216.200.184.0/22216.200.184.0–216.200.187.2551,024
216.200.188.0/22216.200.188.0–216.200.191.2551,024
216.200.192.0/18216.200.192.0–216.200.255.25516,384
216.222.0.0/17216.222.0.0–216.222.127.25532,768
216.227.5.0/24216.227.5.0–216.227.5.255256
216.227.120.0/24216.227.120.0–216.227.120.255256
216.235.128.0/19216.235.128.0–216.235.159.2558,192
216.248.208.0/20216.248.208.0–216.248.223.2554,096

All 249 ranges are listed.

Zayo IPv6 ranges

IPv6 ranges announced by Zayo: CIDR, start and end IP, address count
CIDRStart IP – end IPAddresses
2001:438::/322001:438::–2001:438:ffff:ffff:ffff:ffff:ffff:ffff296
2001:4c8::/322001:4c8::–2001:4c8:ffff:ffff:ffff:ffff:ffff:ffff296
2001:4c8:1092::/482001:4c8:1092::–2001:4c8:1092:ffff:ffff:ffff:ffff:ffff280
2001:4c8:110a::/482001:4c8:110a::–2001:4c8:110a:ffff:ffff:ffff:ffff:ffff280
2001:df0:7c80::/482001:df0:7c80::–2001:df0:7c80:ffff:ffff:ffff:ffff:ffff280
2001:1b70:b3::/482001:1b70:b3::–2001:1b70:b3:ffff:ffff:ffff:ffff:ffff280
2602:807:400c::/482602:807:400c::–2602:807:400c:ffff:ffff:ffff:ffff:ffff280
2602:fdbe::/362602:fdbe::–2602:fdbe:fff:ffff:ffff:ffff:ffff:ffff292
2604:b040:b::/482604:b040:b::–2604:b040:b:ffff:ffff:ffff:ffff:ffff280
2604:e500::/322604:e500::–2604:e500:ffff:ffff:ffff:ffff:ffff:ffff296
2607:c200:1106::/482607:c200:1106::–2607:c200:1106:ffff:ffff:ffff:ffff:ffff280
2800:870:1002::/482800:870:1002::–2800:870:1002:ffff:ffff:ffff:ffff:ffff280
2a00:16f8::/322a00:16f8::–2a00:16f8:ffff:ffff:ffff:ffff:ffff:ffff296

All 13 ranges are listed.

About the Zayo IP range data

  • ASNs and holders

    Zayo announces its prefixes from AS6461. Holders in the registry: AS6461 (ZAYO-6461 - Zayo Bandwidth).

  • What the list contains

    The ranges are the prefixes these ASNs announce in the public BGP routing table (obtained through RIPEstat), with adjacent blocks left unmerged. This is not an ownership record: it can include prefixes of customers and leased address space, and it can miss routes that very few peers see. Snapshot of 2026-11-02.

  • Typical uses

    Allow or block traffic from Zayo in a firewall, WAF or nginx, label source IPs in your logs by network, or test with a CIDR match whether an IP belongs to Zayo. Remember that cloud and carrier address space also runs the services of customers, so blocking a whole network can hit unrelated sites.

How to use the Zayo IP list

  1. Start with the tables above: one for IPv4 and one for IPv6, each row with CIDR, start IP – end IP and address count.
  2. Choose Download TXT or Download CSV for the complete list. The file has all 262 ranges, not only the first rows shown on the page.
  3. Import the TXT as one address set into your firewall, router or ipset, or paste the CIDRs into a cloud security group rule.
  4. Check the snapshot date (2026-11-02) before using it in production. Cloud ranges change often, so compare with the official range file published by the provider.

Zayo IP ranges: frequently asked questions

How many IP ranges does Zayo have?

As of 2026-11-02, Zayo announces 249 IPv4 prefixes covering 1,761,536 addresses and 13 IPv6 prefixes in the public BGP routing table, through AS6461.

What is the ASN of Zayo?

Zayo uses AS6461. Holders in the registry: AS6461 (ZAYO-6461 - Zayo Bandwidth). Large organisations often run several ASNs, and this page merges the ones listed here.

How do I use the Zayo IP list for a firewall allowlist or blocklist?

Download the TXT file (one CIDR per line) and import it into ipset, nftables, an nginx allow or deny include, a router address list or a cloud security group. Import the 262 ranges as one address set rather than as separate rules. The address space of Zayo also hosts the services of its customers, so blocking all of it can cut off unrelated sites.

How often is the Zayo IP list updated?

The list is a snapshot of 2026-11-02, regenerated about once a week from public BGP data (RIPEstat). Announcements change every day, so download it again before using it in production, and for cloud providers also compare it with the official range file they publish.

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