No-IP Plus Managed DNS service can be used with practically every top level domain name.

• Global top level domains (gTLDs) - .com, .net, .org, .edu, .gov,
• Sponsored top level domains (sTLDs) - .biz, .info, .aero, .coop, .name, and .pro
• Country code top level domains (ccTLDs) - .ac, .ae, .ag, .ar, .as, .at, .au, .aw, .bb, .be, .bg, .bm, .bo, .br, .by, .bz, .ca, .cc, .cd, .ch, .cl, .cn, .co, .cr, .cx, .cz, .de, .dj, .do, .ec, .ee, .es, .fi, .fm, .fr, .gg, .gi, .gl, .gr, .gs, .gt, .hk, .hm, .hr, .ht, .hu, .id, .ie, .il, .im, .is, .it, .je, .jp, .kr, .ky, .la, .li, .lk, .lt, .lu, .lv, .md, .mo, .ms, .mt, .mu, .mx, .my, .no, .nr, .nu, .nz, .pa, .pe, .ph, .pk, .pl, .pt, .ro, .ru, .sa, .se, .sg, .sh, .si, .sk, .st, .tc, .th, .tk, .to, .tr, .tv, .tw, .uk, .us, .uy, .uz, .vc, .ve, .vg, .vn, .vu, .ws, and .za
• All other domains in the ICANN root servers should work fine.

These TLDs will not work with No-IP Plus:

• The ccTLDs .nl and .dk have policies that make it difficult or impossible for them to delegate domains to No-IP.
• Domains in "alternate roots" such as new.net are not supported.