| 2001:400::/23 | WHOIS (ARIN) | American Registry for Internet Numbers | US |
| 2001:500:a000::/35 | ARIN available | β | ZZ |
| 2001:500:1000::/36 | ARIN available | β | ZZ |
| 2001:500:2000::/36 | ARIN available | β | ZZ |
| 2001:500:5000::/36 | ARIN available | β | ZZ |
| 2001:500:6000::/36 | ARIN available | β | ZZ |
| 2001:500:9000::/36 | ARIN available | β | ZZ |
| 2001:500:c000::/36 | ARIN available | β | ZZ |
| 2001:500:f000::/36 | ARIN available | β | ZZ |
| 2001:500:800::/37 | ARIN available | β | ZZ |
| 2001:500:3800::/37 | ARIN available | β | ZZ |
| 2001:500:4800::/37 | ARIN available | β | ZZ |
| 2001:500:7000::/37 | ARIN available | β | ZZ |
| 2001:500:8800::/37 | ARIN available | β | ZZ |
| 2001:500:d000::/37 | ARIN available | β | ZZ |
| 2001:500:e000::/37 | ARIN available | β | ZZ |
| 2001:500:7c00::/38 | ARIN available | β | ZZ |
| 2001:500:400::/38 | ARIN available | β | ZZ |
| 2001:500:4000::/38 | ARIN available | β | ZZ |
| 2001:500:8000::/38 | ARIN available | β | ZZ |
| 2001:500:dc00::/38 | ARIN available | β | ZZ |
| 2001:500:e800::/38 | ARIN available | β | ZZ |
| 2001:500:7a00::/39 | ARIN available | β | ZZ |
| 2001:500:3200::/39 | ARIN available | β | ZZ |
| 2001:500:3400::/39 | ARIN available | β | ZZ |
| 2001:500:4600::/39 | ARIN available | β | ZZ |
| 2001:500:8600::/39 | ARIN available | β | ZZ |
| 2001:500:da00::/39 | ARIN available | β | ZZ |
| 2001:500:ee00::/39 | ARIN available | β | ZZ |
| 2001:500:3100::/40 | ARIN available | β | ZZ |
| 2001:500:3700::/40 | ARIN available | β | ZZ |
| 2001:500:4500::/40 | ARIN available | β | ZZ |
| 2001:500:7800::/40 | ARIN available | β | ZZ |
| 2001:500:8400::/40 | ARIN available | β | ZZ |
| 2001:500:d800::/40 | ARIN available | β | ZZ |
| 2001:500:ec00::/40 | ARIN available | β | ZZ |
| 2001:500:180::/41 | ARIN available | β | ZZ |
| 2001:500:280::/41 | ARIN available | β | ZZ |
| 2001:500:300::/41 | ARIN available | β | ZZ |
| 2001:500:3000::/41 | ARIN available | β | ZZ |
| 2001:500:3600::/41 | ARIN available | β | ZZ |
| 2001:500:4480::/41 | ARIN available | β | ZZ |
| 2001:500:7980::/41 | ARIN available | β | ZZ |
| 2001:500:8580::/41 | ARIN available | β | ZZ |
| 2001:500:d980::/41 | ARIN available | β | ZZ |
| 2001:500:ed80::/41 | ARIN available | β | ZZ |
| 2001:500:36c0::/42 | ARIN available | β | ZZ |
| 2001:500:140::/42 | ARIN available | β | ZZ |
| 2001:500:240::/42 | ARIN available | β | ZZ |
| 2001:500:380::/42 | ARIN available | β | ZZ |
| 2001:500:3080::/42 | ARIN available | β | ZZ |
| 2001:500:120::/43 | WHOIS (ARIN) | VeriSign Global Registry Services | β |
| 2001:500:c0::/43 | WHOIS (ARIN) | Afilias, Inc. | β |
| 2001:500:40::/44 | WHOIS (ARIN) | Afilias, Inc. | β |
| 2001:500:200::/44 | BGP route | AS394353 B.Root-Server-OPS | β |
| 2001:500:200::/44 | WHOIS (ARIN) | B.Root-Server-OPS | β |
| 2001:500:e0::/44 | WHOIS (ARIN) | Afilias, Inc. | β |
| 2001:500:8::/45 | WHOIS (ARIN) | Afilias, Inc. | US |
| 2001:500:18::/45 | WHOIS (ARIN) | Afilias, Inc. | US |
| 2001:500:20::/45 | WHOIS (ARIN) | Afilias, Inc. | US |
| 2001:500:90::/45 | WHOIS (ARIN) | Dynamic Network Services, Inc. | US |
| 2001:500:100::/45 | WHOIS (ARIN) | Identity Digital Inc. | US |
| 2001:500:8c::/46 | WHOIS (ARIN) | ICANN | β |
| 2001:500:28::/46 | WHOIS (ARIN) | Afilias, Inc. | US |
| 2001:500:50::/46 | WHOIS (ARIN) | Afilias, Inc. | US |
| 2001:500:80::/46 | WHOIS (ARIN) | CIRA Canadian Internet Registration Authority Autorit Canadienne pour les enregistrements Internet | CA |
| 2001:500:a0::/46 | WHOIS (ARIN) | Afilias, Inc. | US |
| 2001:500:2e::/47 | BGP route | AS3557 Internet Systems Consortium, Inc. | β |
| 2001:500:2e::/47 | WHOIS (ARIN) | Internet Systems Consortium, Inc. | US |
| 2001:500:6::/47 | WHOIS (ARIN) | Afilias, Inc. | US |
| 2001:500:9a::/47 | BGP route | AS30133 Internet Systems Consortium, Inc. | β |
| 2001:500:9a::/47 | WHOIS (ARIN) | Internet Systems Consortium, Inc. | US |
| 2001:500:9c::/47 | WHOIS (ARIN) | ICANN | US |
| 2001:500:9e::/47 | BGP route | AS20144 ICANN | β |
| 2001:500:9e::/47 | WHOIS (ARIN) | ICANN | US |
| 2001:500:14::/47 | WHOIS (ARIN) | WoodyNet, Inc. | US |
| 2001:500:16::/47 | WHOIS (ARIN) | Afilias, Inc. | US |
| 2001:500:54::/47 | WHOIS (ARIN) | Afilias, Inc. | US |
| 2001:500:86::/47 | WHOIS (ARIN) | ICANN | US |
| 2001:500:108::/47 | WHOIS (ARIN) | Identity Digital Inc. | US |
| 2001:500:a4::/47 | WHOIS (ARIN) | Afilias, Inc. | US |
| 2001:500:1::/48 | BGP route | AS1508 Headquarters, USAISC | β |
| 2001:500:1::/48 | WHOIS (ARIN) | U.S. Army Research Laboratory | β |
| 2001:500:1a::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:1b::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:1c::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:1d::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:1e::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:2::/48 | BGP route | AS2149 Cogent Communications, LLC | β |
| 2001:500:2::/48 | WHOIS (ARIN) | Cogent Communications, LLC | US |
| 2001:500:2c::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:2c::/48 | WHOIS (ARIN) | Afilias, Inc. | US |
| 2001:500:2d::/48 | BGP route | AS10886 University of Maryland | β |
| 2001:500:2d::/48 | WHOIS (ARIN) | University of Maryland | US |
| 2001:500:2f::/48 | BGP route | AS3557 Internet Systems Consortium, Inc. | β |
| 2001:500:3::/48 | BGP route | AS20144 ICANN | β |
| 2001:500:3::/48 | WHOIS (ARIN) | ICANN | US |
| 2001:500:4::/48 | BGP route | AS10745 ARIN Operations | β |
| 2001:500:4::/48 | WHOIS (ARIN) | ARIN Operations | β |
| 2001:500:10::/48 | WHOIS (ARIN) | Gauss Research Laboratory, Inc. | PR |
| 2001:500:11::/48 | WHOIS (ARIN) | ICANN | US |
| 2001:500:12::/48 | BGP route | AS5927 United States Department of Defense (DoD) | β |
| 2001:500:12::/48 | WHOIS (ARIN) | United States Department of Defense (DoD) | US |
| 2001:500:13::/48 | BGP route | AS393225 ARIN Operations | β |
| 2001:500:13::/48 | WHOIS (ARIN) | ARIN Operations | US |
| 2001:500:14::/48 | BGP route | AS42 WoodyNet, Inc. | β |
| 2001:500:15::/48 | BGP route | AS715 WoodyNet, Inc. | β |
| 2001:500:16::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:17::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:18::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:19::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:20::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:21::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:22::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:23::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:24::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:25::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:26::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:27::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:28::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:29::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:30::/48 | WHOIS (ARIN) | ARIN Operations | US |
| 2001:500:31::/48 | BGP route | AS393220 ARIN Operations | β |
| 2001:500:31::/48 | WHOIS (ARIN) | ARIN Operations | US |
| 2001:500:40::/48 | BGP route | AS207266 Identity Digital Limited | β |
| 2001:500:41::/48 | BGP route | AS207266 Identity Digital Limited | β |
| 2001:500:42::/48 | BGP route | AS207266 Identity Digital Limited | β |
| 2001:500:43::/48 | BGP route | AS207266 Identity Digital Limited | β |
| 2001:500:44::/48 | BGP route | AS207266 Identity Digital Limited | β |
| 2001:500:46::/48 | BGP route | AS207266 Identity Digital Limited | β |
| 2001:500:47::/48 | BGP route | AS207266 Identity Digital Limited | β |
| 2001:500:48::/48 | BGP route | AS207266 Identity Digital Limited | β |
| 2001:500:49::/48 | BGP route | AS207266 Identity Digital Limited | β |
| 2001:500:56::/48 | WHOIS (ARIN) | Afilias, Inc. | US |
| 2001:500:60::/48 | WHOIS (ARIN) | Internet Systems Consortium, Inc. | US |
| 2001:500:61::/48 | WHOIS (ARIN) | Internet Systems Consortium, Inc. | US |
| 2001:500:62::/48 | WHOIS (ARIN) | Internet Systems Consortium, Inc. | US |
| 2001:500:63::/48 | WHOIS (ARIN) | Internet Systems Consortium, Inc. | US |
| 2001:500:64::/48 | WHOIS (ARIN) | Internet Systems Consortium, Inc. | US |
| 2001:500:65::/48 | WHOIS (ARIN) | Internet Systems Consortium, Inc. | US |
| 2001:500:66::/48 | WHOIS (ARIN) | Internet Systems Consortium, Inc. | US |
| 2001:500:67::/48 | WHOIS (ARIN) | Internet Systems Consortium, Inc. | US |
| 2001:500:68::/48 | WHOIS (ARIN) | Internet Systems Consortium, Inc. | US |
| 2001:500:69::/48 | WHOIS (ARIN) | Internet Systems Consortium, Inc. | US |
| 2001:500:a::/48 | BGP route | AS13901 Afilias, Inc. | β |
| 2001:500:b::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:c::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:d::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:e::/48 | BGP route | AS12041 Afilias, Inc. | β |
| 2001:500:f::/48 | BGP route | AS12041 Afilias, Inc. | β |