About RIPE NCC | Contact  | Search | Sitemap    
Homepage RIPE NCC  
IPv6 Allocations
     
Next Sectionyou are here: home -> Internet Resources
Internet Resources:
RIPE NCC Navigation Ends
Link to IPv4 Addresses IPv4
Link to IPv6 Addresses IPv6
Link to AS Numbers AS Numbers
Reverse DNS Reverse DNS
Link to ENUM ENUM
Ticket Queries
Link to contact Contact Registration Services
Link to Resources News Archive News Archive
RIPE NCC Navigation Ends
Next Section

IPv6 allocations by ARIN

Country RIR allocation Whois allocation Netname Date
US 2001:400::/32 2001:400::/32 ESNET-V6 19990803
CA 2001:410::/32 2001:410::/32 CANET3-IPV6 20000327
US 2001:418::/32 2001:418::/32 NTTA-IPV6-0 20000524
US 2001:420::/32 2001:420::/32 CISCO-IPV6-1 20000614
US 2001:428::/32 2001:428::/32 QWEST-IPV6-1 20000712
US 2001:438::/32 2001:438::/32 ABOVENET-IPV6 20000925
US 2001:440::/32 2001:440::/32 SPRINT-V6 20000929
MX 2001:448::/32 2001:448::/32 UNAM-IPV6 20001025
US 2001:450::/32 2001:450::/32 GBLX-V6 20010102
US 2001:458::/32 2001:458::/32 STEALTH-IPV6-1 20010201
US 2001:460::/32 2001:460::/32 SAVVI-3 20041118
US 2001:468::/32 2001:468::/32 INTERNET2 20010312
US 2001:470::/32 2001:470::/32 HURRICANE-IPV6 20010322
US 2001:478::/32 2001:478::/32 EP-NET 20010521
US 2001:480::/32 2001:480::/32 DREN-V6 20010614
MX 2001:488::/32 2001:488::/32 AVANTEL-IPV6-1 20010628
US 2001:490::/32 2001:490::/32 NOKIA-1 20010711
MX 2001:498::/32 2001:498::/32 ITESM-IPV6 20010823
MX 2001:4a8::/32 2001:4a8::/32 AXTEL-IPV6-1 20011010
US 2001:4b0::/32 2001:4b0::/32 AOLTIMEWARNER 20011113
US 2001:4b8::/32 2001:4b8::/32 WAYPORT-IPV6 20020104
CA 2001:4c0::/32 2001:4c0::/32 ALIANT-6NET 20041122
CA 2001:4c8::/32 2001:4c8::/32 MTSALR-IPV6-1 20041201
US 2001:4d0::/32 2001:4d0::/32 NASA-PCCA-V6 20020501
US 2001:4d8::/32 2001:4d8::/32 DOTNET-001 20020523
US 2001:4e0::/32 2001:4e0::/32 WISCNET-V6 20020612
CA 2001:4e8::/32 2001:4e8::/32 SHAWIPV6 20020709
US 2001:4f8::/32 2001:4f8::/32 ISC6-1 20020802
US 2001:500::/48 2001:500::/48 MICRO-BLK 20020819
US 2001:500:1::/48 2001:400::/23 ARIN-001 20021122
US 2001:500:2::/48 2001:500:2::/48 COGC-6NET-0002 20021219
US 2001:500:3::/48 2001:400::/23 ARIN-001 20030219
US 2001:500:4::/48 2001:500:4::/48 ARIN-V6-COLOCATION-NETWORK 20060313
US 2001:500:12::/48 2001:500:12::/48 DNIC-INFRASTRUCTURE 20070403
US 2001:500:2e::/47 2001:400::/23 ARIN-001 20080107
US 2001:502:100e::/48 2001:502:100e::/48 ULTRADNS-G-V64 20041130
US 2001:502:2eda::/48 2001:502:2eda::/48 ULTRADNS-G-V66 20041130
US 2001:502:4612::/48 2001:502:4612::/48 ULTRADNS-G-V67 20041130
US 2001:502:7a71::/48 2001:502:7a71::/48 ULTRADNS-G-V62 20041130
US 2001:502:ad09::/48 2001:502:ad09::/48 ULTRADNS-G-V65 20041130
US 2001:502:cfb5::/48 2001:502:cfb5::/48 ULTRADNS-G-V63 20041130
US 2001:502:d399::/48 2001:502:d399::/48 ULTRADNS-G-V61 20041130
US 2001:502:f3ff::/48 2001:502:f3ff::/48 ULTRADNS-G-V68 20041130
US 2001:503:c27::/48 2001:503:c27::/48 B-GTLD-SERVERS-NET 20040603
US 2001:503:d2d::/48 2001:503:d2d::/48 VNDS-NET0C 20040603
US 2001:503:231d::/48 2001:503:231d::/48 VNDS-NET02 20040603
US 2001:503:3227::/48 2001:503:3227::/48 VNDS-NET0A 20040603
US 2001:503:39c1::/48 2001:503:39c1::/48 VNDS-NET12 20040603
US 2001:503:4872::/48 2001:503:4872::/48 VNDS-NET11 20040603
US 2001:503:5ae2::/48 2001:503:5ae2::/48 VNDS-NET06 20040603
US 2001:503:6810::/48 2001:503:6810::/48 VNDS-NET07 20040603
US 2001:503:7bbb::/48 2001:503:7bbb::/48 NEUSTAR-BLK4 20040812
US 2001:503:7bbf::/48 2001:503:7bbf::/48 VNDS-NET0E 20040603
US 2001:503:8028::/48 2001:503:8028::/48 NEUSTAR-BLK5 20040813
US 2001:503:83eb::/48 2001:503:83eb::/48 VNDS-NET09 20040603
US 2001:503:a124::/48 2001:503:a124::/48 NEUSTAR-BLK7 20040813
US 2001:503:a83e::/48 2001:503:a83e::/48 A-GTLD-SERVERS-NET 20040603
US 2001:503:ba3e::/48 2001:400::/23 ARIN-001 20040603
US 2001:503:c779::/48 2001:503:c779::/48 NEUSTAR-BLK3 20040812
US 2001:503:cc2c::/48 2001:503:cc2c::/48 VNDS-NET0D 20040603
US 2001:503:d1ae::/48 2001:503:d1ae::/48 NEUSTAR-BLK6 20040813
US 2001:503:d414::/48 2001:503:d414::/48 VNDS-NET0F 20040603
US 2001:503:e239::/48 2001:503:e239::/48 NEUSTAR-BLK11 20070727
US 2001:503:eea3::/48 2001:503:eea3::/48 VNDS-NET10 20040603
US 2001:503:f189::/48 2001:503:f189::/48 VNDS-NET0B 20040603
US 2001:503:f3da::/48 2001:503:f3da::/48 VNDS-NET08 20040603
US 2001:503:ff39::/48 2001:503:ff39::/48 VNDS-NET05 20040603
US 2001:504::/48 2001:504::/48 EQUINIX-IX-V6 20021014
US 2001:504:1::/48 2001:504:1::/48 NYIIX 20021014
US 2001:504:2::/48 2001:504:2::/48 VERIZON-BUSINESS-MAE-IX-IPV6-1 20030205
US 2001:504:3::/48 2001:504:3::/48 VERIZON-BUSINESS-MAE-IX-IPV6-2 20030205
US 2001:504:4::/48 2001:504:4::/48 VERIZON-BUSINESS-MAE-IX-IPV6-3 20030205
US 2001:504:5::/48 2001:504:5::/48 VERIZON-BUSINESS-MAE-IX-IPV6-4 20030205
US 2001:504:6::/48 2001:504:6::/48 VERIZON-BUSINESS-MAE-IX-IPV6-5 20030205
US 2001:504:7::/48 2001:504:7::/48 VERIZON-BUSINESS-MAE-IX-IPV6-6 20030205
US 2001:504:8::/48 2001:504:8::/48 VERIZON-BUSINESS-MAE-IX-IPV6-7 20030205
US 2001:504:9::/48 2001:504:9::/48 VERIZON-BUSINESS-MAE-IX-IPV6-8 20030205
US 2001:504:a::/48 2001:504:a::/48 LAIIX 20040805
US 2001:504:c::/48 2001:504:c::/48 TERRENAP-V6 20050610
US 2001:504:d::/48 2001:504:d::/48 PAIX-IPV6 20060629
US 2001:504:e::/48 2001:504:e::/48 PAIX-IPV6 20060629
US 2001:504:f::/48 2001:504:f::/48 PAIX-IPV6 20060629
US 2001:504:10::/48 2001:504:10::/48 PAIX-IPV6 20060629
US 2001:504:11::/48 2001:504:11::/48 PAIX-IPV6 20060629
US 2001:504:12::/48 2001:504:12::/48 PAIX-IPV6 20060629
US 2001:504:13::/48 2001:504:13::/48 ONE-WILSHIRE-PACKET-EXCHANGE 20070129
US 2001:504:14::/48 2001:504:14::/48 MXN-CHIX-V6-1 20080411
CA 2001:504:15::/48 2001:504:15::/48 CONNECT-ONE 20080512
US 2001:506::/48 2001:506::/48 Notspecified 20070117
US 2001:506:8::/48 2001:506:8::/48 TWTC-V6-02 20080507
US 2001:506:10::/45 2001:506:10::/45 ATTWV6-1 20070925
CA 2001:510::/32 2001:510::/32 RISQ 20020930
US 2001:518::/32 2001:518::/32 NAC-IPV6-01 20021009
US 2001:520::/32 2001:520::/32 FLADMS-IPV6 20021015
US 2001:530::/32 2001:530::/32 HIGHSPEEDWEB-IPV6 20021031
US 2001:538::/32 2001:538::/32 SGNS-V6-BLK-1 20021113
US 2001:540::/32 2001:540::/32 ICGV6INIT 20021126
US 2001:550::/32 2001:550::/32 COGC-6NET-0001 20021217
US 2001:558::/32 2001:558::/32 COMCAST6NET 20030106
US 2001:560::/32 2001:560::/32 ISOMEDIA-IPV6 20030106
CA 2001:568::/32 2001:568::/32 TELUS-V6-0001 20030109
US 2001:570::/32 2001:570::/32 VERIZON-BUSINESS-MAE-AS6066-IPV6 20030205
US 2001:578::/32 2001:578::/32 NETBLK-COXIPV6 20030206
US 2001:580::/32 2001:580::/32 OREGON-IPV6 20030211
US 2001:590::/32 2001:590::/32 NLYR-V6-1 20030225
CA 2001:598::/32 2001:598::/32 NETBLOCK-MTO-V6-01 20030305
CA 2001:5a0::/32 2001:5a0::/32 GLBE-V6-1 20030305
US 2001:5a8::/32 2001:5a8::/32 SONIC-V6BLK 20030306
US 2001:5b0::/32 2001:5b0::/32 SPACEWAYNET 20030306
US 2001:5b8::/32 2001:5b8::/32 HOST-IPV6 20030312
CA 2001:5c0::/32 2001:5c0::/32 HEXAGO-V6-NET1 20030312
US 2001:5c8::/32 2001:5c8::/32 WARE-V6 20030319
US 2001:5d0::/32 2001:5d0::/32 NERICV6 20030326
US 2001:5d8::/32 2001:5d8::/32 SEMA-V6-1 20030404
US 2001:5e0::/32 2001:5e0::/32 NOANET-V6-BLK1 20030404
US 2001:5e8::/32 2001:5e8::/32 PSCNET-V6 20030417
US 2001:5f0::/32 2001:5f0::/32 OEN-V6-1 20030428
US 2001:5f8::/32 2001:5f8::/32 NETINS-V6-BLK 20030509
US 2001:1800::/32 2001:1800::/32 SWCPV6-1 20030523
US 2001:1810::/32 2001:1810::/32 MEGA-4 20030610
US 2001:1818::/32 2001:1818::/32 OCIP-V6NET1 20030620
US 2001:1820::/32 2001:1820::/32 TDATANET-IPV6 20030620
US 2001:1830::/32 2001:1830::/32 RLCN-V6-NET-01 20030620
US 2001:1838::/32 2001:1838::/32 SCN-1-IPV6 20030627
US 2001:1840::/32 2001:1840::/32 BOEING-IPV6-2001-1840 20030627
US 2001:1848::/32 2001:1848::/32 ICN 20030716
US 2001:1850::/32 2001:1850::/32 CRTV6 20030716
US 2001:1858::/32 2001:1858::/32 SPEK-V6-0 20030807
US 2001:1860::/32 2001:1860::/32 PNWGP-V6 20030826
US 2001:1868::/32 2001:1868::/32 LAYER42-V6 20030827
US 2001:1870::/32 2001:1870::/32 ELANNET-IP6 20030829
US 2001:1878::/32 2001:1878::/32 LN-V6-BLK-1 20030925
US 2001:1888::/32 2001:1888::/32 LAVANET-IPV6-1 20031015
US 2001:1890::/32 2001:1890::/32 ATTWV6-1 20031027
US 2001:1898::/32 2001:1898::/32 GNI-IPV6 20031027
US 2001:18a0::/32 2001:18a0::/32 POCKETINET-IP6 20031027
US 2001:18b8::/32 2001:18b8::/32 REFLECTED-INET 20031201
US 2001:18c8::/32 2001:18c8::/32 VISI-IPV6-1 20031218
US 2001:18d0::/32 2001:18d0::/32 AUGUST-V6-1 20031218
US 2001:18d8::/32 2001:18d8::/32 COLUMBIA-6 20031222
US 2001:18e0::/32 2001:18e0::/32 NETPLEX-V6 20031230
US 2001:18e8::/32 2001:18e8::/32 INDIANAGPOP-V6 20031231
CA 2001:18f0::/32 2001:18f0::/32 ILAPIPV6 20040105
CA 2001:18f8::/32 2001:18f8::/32 MAGMA-IPV6-1 20040105
US 2001:1900::/32 2001:1900::/32 LVLT-IPV6 20040107
US 2001:1908::/32 2001:1908::/32 CHOICE-ONE-COM 20040107
US 2001:1910::/32 2001:1910::/32 EXOBIT-IPV6-1 20040108
US 2001:1918::/32 2001:1918::/32 DISN 20040121
CA 2001:1920::/32 2001:1920::/32 GOCIP6NET 20040204
CA 2001:1928::/32 2001:1928::/32 EICAT-NETBLKV6 20040205
US 2001:1930::/32 2001:1930::/32 SSA-V6 20040217
US 2001:1938::/32 2001:1938::/32 HIGHWINDS6 20040223
US 2001:1940::/32 2001:1940::/32 TRANSARIA 20040615
US 2001:1948::/32 2001:1948::/32 UEN-V6 20040315
US 2001:1950::/32 2001:1950::/32 MORICV6 20040413
US 2001:1958::/32 2001:1958::/32 HOL-IPV6-1 20040420
US 2001:1960::/32 2001:1960::/32 FRONTIER-COMMUNICATIONS-OF-AMERICA-INC 20040514
US 2001:1968::/32 2001:1968::/32 NORLIPV6 20040520
US 2001:1978::/32 2001:1978::/32 PEER1-IPV6-01 20040614
US 2001:1980::/32 2001:1980::/32 CRNC-V6-1 20040614
US 2001:1988::/32 2001:1988::/32 NEXTWEB-V6-1 20040617
US 2001:1990::/32 2001:1990::/32 NETWORK-V6-2001-1990-32 20040712
US 2001:1998::/32 2001:1998::/32 RRMA 20040712
US 2001:19a0::/32 2001:19a0::/32 CITYNETV6 20040713
CA 2001:19a8::/32 2001:19a8::/32 NORTEL-IPV6 20040722
US 2001:19b0::/32 2001:19b0::/32 LIGHTSHIP-IPV6 20040730
US 2001:19b8::/32 2001:19b8::/32 TIER6-3 20040812
CA 2001:19c0::/32 2001:19c0::/32 GTCOMM6 20040812
US 2001:19c8::/32 2001:19c8::/32 DSLE-NWK-5 20040913
US 2001:19d0::/32 2001:19d0::/32 IINET-IPV6 20040921
US 2001:19e0::/32 2001:19e0::/32 XIOCOM-V6-1 20041011
US 2001:19e8::/32 2001:19e8::/32 DOTNET-V6 20041025
US 2001:19f0::/32 2001:19f0::/32 CHOOPA 20041108
US 2001:19f8::/32 2001:19f8::/32 IMPULSE-V6BLK1 20041115
US 2001:4800::/32 2001:4800::/32 RSPC 20041201
US 2001:4808::/32 2001:4808::/32 DONET-BLK-IPV6 20041215
US 2001:4810::/32 2001:4810::/32 HOTNIC-IPV6 20041215
CA 2001:4818::/32 2001:4818::/32 Q9V6-NET1 20041216
MW 2001:4820::/32 2001:4820::/32 NICMW-MWSDNP-IPV6-1 20041221
US 2001:4828::/32 2001:4828::/32 CITCV6 20041228
US 2001:4830::/32 2001:4830::/32 TWDX-NET6BLK-ARIN-1 20050105
US 2001:4838::/32 2001:4838::/32 CIRN-6-NETBLOCK01 20050120
US 2001:4840::/32 2001:4840::/32 EARTHLINK-IPV6-001 20050131
US 2001:4848::/32 2001:4848::/32 KCNAP-IPV6-BLOCK1 20050209
US 2001:4850::/32 2001:4850::/32 ERCWC-6NET 20050223
US 2001:4858::/32 2001:4858::/32 WII-IPV6-BLOCK1 20050303
US 2001:4860::/32 2001:4860::/32 GOOGLE-IPV6 20050314
US 2001:4868::/32 2001:4868::/32 TERRENAP-V6 20050314
US 2001:4870::/32 2001:4870::/32 TWTC-V6-01 20050314
US 2001:4878::/32 2001:4878::/32 AKAMAI-ARIN-V6-1 20050317
US 2001:4880::/32 2001:4880::/32 NLR-V6 20050404
US 2001:4888::/32 2001:4888::/32 WIRELESSDATANETWORK 20050411
US 2001:4890::/32 2001:4890::/32 NETBLK-MZIMA6-01 20050421
US 2001:4898::/32 2001:4898::/32 MICROSOFT-IPV6-BLK 20050421
US 2001:48a0::/32 2001:48a0::/32 OOL-V6 20050425
US 2001:48a8::/32 2001:48a8::/32 MICH-V6-1 20050428
US 2001:48b0::/32 2001:48b0::/32 IIJA 20050504
US 2001:48b8::/32 2001:48b8::/32 VISUAL-LINK-IPV6-NETWORK 20050513
US 2001:48c0::/32 2001:48c0::/32 DWNI-V6-BLK1 20050517
US 2001:48c8::/32 2001:48c8::/32 VOXEL-V6 20050517
US 2001:48d0::/32 2001:48d0::/32 SD6NET 20050613
US 2001:48d8::/32 2001:48d8::/32 BUNGI-IPV6-1 20050616
US 2001:48e0::/32 2001:48e0::/32 UNM-IPV6 20050617
US 2001:48e8::/32 2001:48e8::/32 UMASS-NET3 20050620
US 2001:48f0::/32 2001:48f0::/32 SBCIS-SIS80 20050628
US 2001:48f8::/32 2001:48f8::/32 MIDCO-IPV6 20050630
CA 2001:4900::/32 2001:4900::/32 EGATE 20050630
US 2001:4908::/32 2001:4908::/32 CONVERSENT-IPV6 20050705
BM 2001:4910::/32 2001:4910::/32 NRCV6-NET 20050713
US 2001:4918::/32 2001:4918::/32 CROCKERNET 20050714
US 2001:4920::/32 2001:4920::/32 BECHTEL-IPV6 20050721
US 2001:4928::/32 2001:4928::/32 INIPV6NET1 20050802
US 2001:4930::/32 2001:4930::/32 STATE-OF-NORTH-DAKOTA-STAGENET 20050803
CA 2001:4938::/32 2001:4938::/32 NETBLK-IPV6-NDCC-1 20050805
US 2001:4940::/32 2001:4940::/32 WORLDPATH-NET-V6-A 20050830
US 2001:4948::/32 2001:4948::/32 ACSG-1-NET6-1 20050830
US 2001:4950::/32 2001:4950::/32 AMPLEX 20050916
CA 2001:4958::/32 2001:4958::/32 BELLCANADA-V6-100 20050926
US 2001:4960::/32 2001:4960::/32 NEWCOM-INTL-IPV6-1 20051003
US 2001:4970::/32 2001:4970::/32 ADHOST-V6-BLK1 20051019
US 2001:4978::/32 2001:4978::/32 YOURORG-NB6-AR-1 20051020
US 2001:4980::/32 2001:4980::/32 IPHOUSE-IPV6-1 20051025
US 2001:4988::/32 2001:4988::/32 STS-ARIN-2 20051025
US 2001:4990::/32 2001:4990::/32 GTC-V6-1 20051026
US 2001:4998::/32 2001:4998::/32 YAHOO-IPV6-BLK-2 20051027
US 2001:49a0::/32 2001:49a0::/32 YAHOO-IPV6-BLK-3 20051027
US 2001:49a8::/32 2001:49a8::/32 YAHOO-IPV6-BLK-1 20051027
US 2001:49b0::/32 2001:49b0::/32 SWTC-V6 20051027
US 2001:49b8::/32 2001:49b8::/32 SPRINGNET-V6 20051102
US 2001:49c0::/32 2001:49c0::/32 IBM-IPV6-01 20051102
US 2001:49c8::/32 2001:49c8::/32 USDOI 20051110
US 2001:49d0::/32 2001:49d0::/32 KREN-IP6 20051115
US 2001:49d8::/32 2001:49d8::/32 COMMONWEALTH-OF-PA-OA-ENTERPRISE-NETWORK-SVCS 20051122
US 2001:49e0::/32 2001:49e0::/32 SOCKET-V6-ALLOC001 20051123
US 2001:49e8::/32 2001:49e8::/32 COLOGUYSV6-1 20051123
US 2001:49f0::/32 2001:49f0::/32 FDCSERVERS 20051202
US 2001:49f8::/32 2001:49f8::/32 NET-01-SOLUTIONPRO 20051209
US 2600::/29 2600::/29 SPRINT-V6IP 20061221
US 2600:800::/27 2600:800::/27 Notspecified 20070108
US 2607:f000::/32 2607:f000::/32 SNS-PHX-V6 20070514
US 2607:f008::/32 2607:f008::/32 NET-KATTARE-V6-1 20070515
US 2607:f010::/32 2607:f010::/32 UCLANET6 20070515
US 2607:f018::/32 2607:f018::/32 UMICH-V6-0 20070515
US 2607:f020::/32 2607:f020::/32 NET-CGI-US 20070516
US 2607:f028::/32 2607:f028::/32 EDS 20070518
US 2607:f030::/32 2607:f030::/32 CITYNET-V6-1 20070521
US 2607:f038::/32 2607:f038::/32 MOG-IPV6 20070523
CA 2607:f040::/32 2607:f040::/32 SKYWAY6NET-1 20070523
US 2607:f048::/32 2607:f048::/32 FIBERNOC 20070529
US 2607:f050::/32 2607:f050::/32 ATLANTECH-IPV6-A 20070529
US 2607:f058::/32 2607:f058::/32 INOC-V6-01 20070604
US 2607:f060::/32 2607:f060::/32 VOBIZ-ARIN-V6 20070604
US 2607:f068::/32 2607:f068::/32 TULARO-V6-00 20070606
US 2607:f070::/32 2607:f070::/32 CFU-NET-6 20070607
CA 2607:f078::/32 2607:f078::/32 LEXICOM-V6 20070615
US 2607:f080::/32 2607:f080::/32 PNAPV6-06-2007 20070619
US 2607:f088::/32 2607:f088::/32 ARIZONA-V6 20070626
CA 2607:f090::/32 2607:f090::/32 FUTUREWAY-V6 20070702
US 2607:f098::/32 2607:f098::/32 IPV6-NETWORK 20070703
US 2607:f0a0::/32 2607:f0a0::/32 PACIFICINTERNETEXCHANGE-NET 20070712
US 2607:f0a8::/32 2607:f0a8::/32 LAYEREDTECH 20070717
CA 2607:f0b0::/32 2607:f0b0::/32 STORNINTSERV 20070723
US 2607:f0b8::/32 2607:f0b8::/32 BUCKEYE-CABLESYSTEM-V6 20070723
US 2607:f0c0::/32 2607:f0c0::/32 RBNS 20070730
CA 2607:f0c8::/32 2607:f0c8::/32 NETBLK-BNFD-GENERAL 20070730
US 2607:f0d0::/32 2607:f0d0::/32 SOFTLAYER-6-1 20070806
US 2607:f0d8::/32 2607:f0d8::/32 INTEGRA-V6-01 20070806
US 2607:f0e0::/32 2607:f0e0::/32 INLAND-NETWORKS 20070806
US 2607:f0e8::/32 2607:f0e8::/32 PGRV-NET3 20070808
US 2607:f0f0::/32 2607:f0f0::/32